Method and apparatus for frequency domain resource allocation in wireless communication system

ABSTRACT

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a terminal in a communication system is provided. The method includes receiving, from a base station, configuration information for a physical uplink control channel, the configuration information including an index of an interlace resource, identifying two interlace resources based on the configuration information, and transmitting, to the base station, uplink control information on the physical uplink control information using at least one of the two interlace resources, in which the interlace resource is composed of a plurality of resource blocks of which interval between the plurality of resource blocks are identical.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of prior application Ser.No. 16/834,065, filed on Mar. 30, 2020, which will be issued as U.S.Pat. No. 11,510,185 filed on Nov. 22, 2022; which is based on and claimspriority under 35 U.S.C. § 119 of a Korean patent application number10-2019-0036744, filed on Mar. 29, 2019, in the Korean IntellectualProperty Office, and of a Korean patent application number10-2019-0136812, filed on Oct. 30, 2019, in the Korean IntellectualProperty Office, the disclosure of each of which is incorporated byreference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to a wireless communication system. Moreparticularly, the disclosure relates to a method and an apparatus forfrequency domain resource allocation in a wireless communication system.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4^(th) generation (4G) communication systems, efforts havebeen made to develop an improved 5^(th) generation (5G) or pre-5Gcommunication system. Therefore, the 5G or pre-5G communication systemis also called a ‘Beyond 4G Network’ or a ‘Post long term evolution(LTE) System’. The 5G communication system is considered to beimplemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, soas to accomplish higher data rates. To decrease propagation loss of theradio waves and increase the transmission distance, the beamforming,massive multiple-input multiple-output (MIMO), Full Dimensional MIMO(FD-MIMO), array antenna, an analog beam forming, large scale antennatechniques are discussed in 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud Radio Access Networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,Coordinated Multi-Points (CoMP), reception-end interference cancellationand the like. In the 5G system, Hybrid frequency shift keying (FSK) andquadrature amplitude modulation (QAM) Modulation (FQAM) and slidingwindow superposition coding (SWSC) as an advanced coding modulation(ACM), and filter bank multi carrier (FBMC), non-orthogonal multipleaccess (NOMA), and sparse code multiple access (SCMA) as an advancedaccess technology have been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “Security technology” have been demanded forIoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

Further, researches have been made on a licensed assisted access (LAA)technology using an unlicensed band based on a 5G communication system.

The above information is presented as background information only toassist with an understanding of the disclosure. No determination hasbeen made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

Aspects of the disclosure are to address at least the above-mentionedproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the disclosure is to providea method and an apparatus for frequency domain resource allocation in awireless communication system.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method performed by aterminal in a communication system is provided. The method includesreceiving, from a base station, configuration information for a physicaluplink control channel, the configuration information including an indexof an interlace resource, identifying two interlace resources based onthe configuration information; and transmitting, to the base station,uplink control information on the physical uplink control channel usingat least one of the two interlace resources, wherein the interlaceresource is composed of a plurality of resource blocks of which intervalbetween the plurality of resource blocks are identical.

In accordance with another aspect of the disclosure, a method performedby a base station in a communication system is provided. The methodincludes identifying two interlace resources for receiving uplinkcontrol information, transmitting, to a terminal, configurationinformation for a physical uplink control channel, the configurationinformation including an index of an interlace resource according to thetwo interlace resources, receiving, from the terminal, the uplinkcontrol information on the physical uplink control channel using atleast one of the two interlace resources, wherein the interlace resourceis composed of a plurality of resource blocks of which interval betweenthe plurality of resource blocks are identical.

In accordance with another aspect of the disclosure, a terminal in acommunication system is provided. The terminal includes a transceiver,and a controller coupled with the transceiver and configured to receive,from a base station, configuration information for a physical uplinkcontrol channel, the configuration information including an index of aninterlace resource, identify two interlace resources based on theconfiguration information, and transmit, to the base station, uplinkcontrol information on the physical uplink control channel using atleast one of the two interlace resources, wherein the interlace resourceis composed of a plurality of resource blocks of which interval betweenthe plurality of resource blocks are identical.

In accordance with another aspect of the disclosure, a base station in acommunication system is provided. The base station includes atransceiver, and a controller coupled with the transceiver andconfigured to identify two interlace resources for receiving uplinkcontrol information, transmit, to a terminal, configuration informationfor a physical uplink control channel, the configuration informationincluding an index of an interlace resource according to the twointerlace resource, and receive, from the terminal, the uplink controlinformation on the physical uplink control channel using at least one ofthe two interlace resources, wherein the interlace resource is composedof a plurality of resource blocks of which interval between theplurality of resource blocks are identical.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription which, taken in conjunction with the annexed drawings,discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a diagram illustrating a wireless communication systemaccording to an embodiment of the disclosure;

FIG. 2 is a diagram illustrating the configuration of a base station ina wireless communication system according to an embodiment of thedisclosure;

FIG. 3 is a diagram illustrating the configuration of a terminal in awireless communication system according to an embodiment of thedisclosure;

FIG. 4 is a diagram illustrating the configuration of a communicationunit in a wireless communication system according to an embodiment ofthe disclosure;

FIG. 5 is a diagram illustrating an example of a radio resource regionin a wireless communication system according to an embodiment of thedisclosure;

FIG. 6 is a diagram illustrating an example of a channel accessprocedure in an unlicensed band in a wireless communication systemaccording to an embodiment of the disclosure;

FIG. 7 is a diagram illustrating another example of a channel accessprocedure in an unlicensed band in a wireless communication systemaccording to an embodiment of the disclosure;

FIG. 8 is a diagram illustrating an example of scheduling and feedbackin a wireless communication system according to an embodiment of thedisclosure;

FIG. 9A is a diagram illustrating an example of a channel occupancy timeand a slot format in a wireless communication system according to anembodiment of the disclosure;

FIG. 9B is a diagram explaining a method for allocating a frequencyresource in a wireless communication system according to an embodimentof the disclosure;

FIG. 9C is a diagram explaining another method for allocating afrequency domain resource in a wireless communication system accordingto an embodiment of the disclosure;

FIG. 10 is a flowchart of a base station for determining a method forallocating a frequency domain resource in a wireless communicationsystem according to an embodiment of the disclosure;

FIG. 11 is a flowchart of a terminal for determining a method forallocating a frequency domain resource in a wireless communicationsystem according to an embodiment of the disclosure; and

FIG. 12 is another flowchart of a terminal for determining a method forallocating a frequency domain resource in a wireless communicationsystem according to an embodiment of the disclosure.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features, andstructures.

DETAILED DESCRIPTION

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings. In describing thedisclosure, a detailed description of related known functions orconfigurations will be omitted if it is determined that it obscures thedisclosure in unnecessary detail. Further, terms to be described laterare terms defined in consideration of their functions in the disclosure,but may differ depending on intentions of a user or an operator, orcustoms. Accordingly, they should be defined on the basis of thecontents of the whole description of the disclosure.

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the disclosure as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thedisclosure. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of thedisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of thedisclosure is provided for illustration purpose only and not for thepurpose of limiting the disclosure as defined by the appended claims andtheir equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings.

In explaining the embodiments, explanation of technical contents thatare well known in the art to which the disclosure pertains and are notdirectly related to the disclosure will be omitted. This is to transferthe subject matter of the disclosure more clearly without obscuring thesame through omission of unnecessary explanations.

For the same reason, in the accompanying drawings, sizes and relativesizes of some constituent elements may be exaggerated, omitted, orbriefly illustrated. Further, sizes of the respective constituentelements do not completely reflect the actual sizes thereof. In thedrawings, the same drawing reference numerals are used for the same orcorresponding elements across various figures.

The aspects and features of the disclosure and methods for achieving theaspects and features will be apparent by referring to the embodiments tobe described in detail with reference to the accompanying drawings.However, the disclosure is not limited to the embodiments disclosedhereinafter, and it can be implemented in diverse forms. The mattersdefined in the description, such as the detailed construction andelements, are only specific details provided to assist those of ordinaryskill in the art in a comprehensive understanding of the disclosure, andthe disclosure is only defined within the scope of the appended claims.In the entire description of the disclosure, the same drawing referencenumerals are used for the same elements across various figures.

In this case, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operations to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide operations for implementing the functions specified inthe flowchart block or blocks.

Also, each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

In this case, the term “˜unit”, as used in an embodiment, means, but isnot limited to, a software or hardware component, such as fieldprogrammable gate array (FPGA) or application specific integratedcircuit (ASIC), which performs certain tasks. However, “˜unit” is notmeant to be limited to software or hardware. The term “˜unit” mayadvantageously be configured to reside on the addressable storage mediumand configured to execute on one or more processors. Thus, “˜unit” mayinclude, by way of example, components, such as software components,object-oriented software components, class components and taskcomponents, processes, functions, attributes, procedures, subroutines,segments of program code, drivers, firmware, microcode, circuitry, data,databases, data structures, tables, arrays, and variables. Thefunctionality provided for in the components and “˜units” may becombined into fewer components and “˜units” or further separated intoadditional components and “˜units”. Further, the components and “˜units”may be implemented to operate one or more central processing units(CPUs) in a device or a security multimedia card. Further, in anembodiment, “˜unit” may include one or more processors.

A wireless communication system was initially developed for the purposeof providing a voice-oriented service, but it has been expanded to, forexample, a broadband wireless communication system that provides ahigh-speed and high-quality packet data service together with thecommunication standards, such as 3rd Generation Partnership Project(3GPP) high speed packet access (HSPA), long term evolution (LTE) orevolved universal terrestrial radio access (E-UTRA), LTE-advanced(LTE-A), 3GPP2 high rate packet data (HRPD), ultra-mobile broadband(UMB), and institute of electrical and electronics engineers (IEEE)802.16e. Also, for the 5th generation wireless communication system, 5Gor new radio (NR) communication standards have been developed.

In case of a 5G communication system, various technologies will beintroduced, such as retransmission in the unit of a code block group(CBG) in order to provide various services and to support a high datarate, and a technology capable of transmitting an uplink signal withoutuplink scheduling information (e.g., grant-free uplink transmission).Accordingly, in case of performing 5G communication through anunlicensed band, a more efficient channel access procedure inconsideration of various variables is necessary.

In the wireless communication system including the 5th generation (5G)communication system, at least one service of an enhanced mobilebroadband (eMBB), massive machine type communications (mMTC), andultra-reliable and low-latency communications (URLLC) may be provided toa terminal. The above-described services may be provided to the sameterminal during the same time period. In an embodiment, the eMBB may bea service aimed at high-speed transmission of high-capacity data, themMTC may be a service aimed at minimization of a terminal power andaccesses of a plurality of terminals, and the URLLC may be a serviceaimed at high reliability and low latency, but the above-describedservices are not limited thereto. The three kinds of services may beimportant scenarios in an LTE system or post-LTE 5G/NR (new radio ornext radio) systems, but the services are not limited to theabove-described examples. Further, the above-described services of the5G system are exemplary, and possible services of the 5G system are notlimited to the above-described examples. In addition, a system providingan URLLC service may be called an URLLC system, and a system providingan eMBB service may be called an eMBB system. Further, the terms“service” and “system” may be interchangeably or mixedly used.

Hereinafter, a base station is the subject that performs resourceallocation to a terminal, and it may include at least one of eNode B,Node B, base station (BS), radio access unit, base station controller,or node on a network. A terminal may include at least one of userequipment (UE), mobile station (MS), cellular phone, smart phone,computer, or multimedia system capable of performing a communicationfunction. In the disclosure, a downlink (DL) is a radio transmissionpath of a signal that is transmitted from the base station to theterminal, and an uplink (UL) means a radio transmission path of a signalthat is transmitted from the terminal to the base station. Hereinafter,although the LTE or LTE-A system is exemplified in an embodiment of thedisclosure, and in order to explain a method and an apparatus proposedin the disclosure, the terms “physical channel” and “signal” in the LTEor LTE-A system in the related art may be used. Embodiments of thedisclosure may also be applied to other communication systems havingtechnical backgrounds or channel types similar to those of the mobilecommunication system described in the disclosure. For example, the5th-generation (5G) mobile communication technology (5G, new radio, andNR) may be included therein. Further, the embodiments of the disclosuremay also be applied to other communication systems through partialmodifications thereof in a range that does not greatly deviate from thescope of the disclosure by the judgment of those skilled in the art.

In the 5G system or new radio (NR) system that is a representativeexample of broadband wireless communication systems, a downlink (DL)adopts an orthogonal frequency division multiplexing (OFDM) scheme, andan uplink (UL) adopts all schemes of the OFDM, a single carrierfrequency division multiple access (SC-FDMA), and a DFT spread OFDM(DFT-s-OFDM). According to the multiple access schemes, data ofrespective users or control information can be discriminated from eachother by allocating and operating time-frequency domain resources, onwhich the data or the control information is transmitted, so as toprevent the time-frequency resources from overlapping each other, thatis, to establish orthogonality between the time-frequency resources.

The NR system adopts a hybrid automatic repeat request (HARQ) scheme inwhich a physical layer retransmits data if decoding failure occursduring an initial transmission of the corresponding data. According tothe HARQ scheme, a receiver may enable a transmitter to retransmit thecorresponding data on the physical layer by transmitting information(e.g., negative acknowledgement (NACK)) for notifying the transmitter ofthe decoding failure if the receiver has not accurately decoded thedata. The receiver may combine the data retransmitted by the transmitterwith the previous data of which the decoding has failed in order toheighten the data reception performance. Further, according to the HARQscheme, if the receiver has accurately decoded the data, the receivermay transmit information (e.g., acknowledgement (ACK)) for notifying thetransmitter of a decoding success, so that the transmitter transmits newdata.

In the following description, the terms designating signals, channels,control information, network entities, and constituent elements of adevice are exemplified for convenience in explanation. Accordingly, thedisclosure is not limited to the terms to be described later, but otherterms having equivalent technical meanings may be used.

Although various embodiments of the disclosure will be described usingthe terms being used in some communication standards (e.g., 3rdGeneration Partnership Project (3GPP)), they are merely exemplary forexplanation, and the various embodiments of the disclosure may be easilymodified and applied to other communication systems.

Although various embodiments of the disclosure are described based onthe NR system, the contents of the disclosure are not limited to the NRsystem, but may be applied to various wireless communication system,such as LTE, LTE-A, LTE-A-Pro, and 5G. Further, although the contents ofthe disclosure are to describe a system and an apparatus fortransmitting and receiving a signal using an unlicensed band, thecontents of the disclosure may also be able to be applied to a systemoperating in the unlicensed band.

In the disclosure, higher layer signaling or a higher signal may be amethod for transferring a signal from the base station to the terminalusing a downlink data channel of a physical layer or transferring asignal from the terminal to the base station using an uplink datachannel of the physical layer, and it may include at least one ofmethods for transferring a signal that is transferred through radioresource control (RRC) signaling, packet data convergence protocol(PDCP) signaling, or a medium access control (MAC) control element (CE).Further, the higher layer signaling or the higher signal may includesystem information that is commonly transmitted to a plurality ofterminals, for example, a system information block except a masterinformation block, which is transmitted through a physical broadcastchannel (PBCH). In this case, the MIB may also be included in the higherlayer signaling.

FIG. 1 illustrates a wireless communication system according to anembodiment of the disclosure.

Referring to FIG. 1 , a base station 110, a terminal 120, and a terminal130 are exemplified as some of nodes using radio channels in thewireless communication system. Although only one base station isillustrated in FIG. 1 , the wireless communication system may furtherinclude other base stations that are identical or similar to the basestation 110.

The base station 110 is a network infrastructure providing a radioaccess to the terminals 120 and 130. The base station 110 has a coveragethat is defined as a specific geographic area based on a distance withinwhich the base station 110 can transmit a signal. In addition to thebase station, the base station 110 may be called an access point (AP),eNodeB (eNB), gNodeB (gNB), 5th generation node (5G node), wirelesspoint, transmission/reception point (TRP), or another term having thesame technical meaning.

Each of the terminals 120 and 130 is a device used by a user, and itperforms communication with the base station 110 through a radiochannel. According to circumstances, at least one of the terminals 120and 130 may operate without user's participation. That is, at least oneof the terminals 120 and 130 is a device performing machine typecommunication (MTC), and it may not be carried by the user. In additionto the terminal, each of the terminals 120 and 130 may be called userequipment (UE), mobile station, subscriber station, remote terminal,wireless terminal, user device, or another term having the sametechnical meaning.

A wireless communication environment 100 may include wirelesscommunication in an unlicensed band. The base station 110, the terminal120, and the terminal 130 may transmit and receive a radio signal in anunlicensed band (e.g., 5 to 7 GHz or 64 to 71 GHz). In the unlicensedband, a cellular communication system and another communication system(e.g., wireless local area network (WLAN)) may coexist. In order tosecure fairness between the two communication systems, in other words,in order to prevent any one system from exclusively using channels, thebase station 110, the terminal 120, and the terminal 130 may perform achannel access procedure for the unlicensed band. As an example of thechannel access procedure for the unlicensed band, the base station 110,the terminal 120, and the terminal 130 may perform listen before talk(LBT).

The base station 110, the terminal 120, and the terminal 130 maytransmit and receive a radio signal in millimeter wave (mmWave) bands(e.g., 28 GHz, 30 GHz, 38 GHz, and 60 GHz). In this case, in order toimprove a channel gain, the base station 110, the terminal 120, and theterminal 130 may perform beamforming. Here, the beamforming may includetransmission beamforming and reception beamforming. That is, the basestation 110, the terminal 120, and the terminal 130 may give directivityto a transmitted signal or a received signal. For this, the base station110, the terminal 120, and the terminal 130 may select serving beams(112, 113, 121, 131) through a beam search or beam management procedure.After the serving beams are selected, the subsequent communication maybe performed through a resource that is in quasi co-located (QCL)relationship with the resource on which the serving beams have beentransmitted.

FIG. 2 illustrates the configuration of a base station in a wirelesscommunication system according to an embodiment of the disclosure.

The configuration exemplified in FIG. 2 may be understood as theconfiguration of the base station 110. The term “˜unit” or “˜er”, asused hereinafter, may mean a unit for processing at least one functionor operation, and it may be implemented by software, hardware, or acombination of the software and the hardware.

Referring to FIG. 2 , the base station includes a wireless transceiver210, a backhaul communication unit 220, a memory 230, and a controller240.

The wireless transceiver 210 performs functions for transmitting andreceiving a signal through a radio channel. For example, the wirelesstransceiver 210 performs a conversion function between a baseband signaland a bit string in accordance with physical layer standards of asystem. For example, during data transmission, the wireless transceiver210 creates complex symbols by encoding and modulating transmitted bitstrings. Further, during data reception, the wireless transceiver 210restores the received bit strings through demodulation and decoding ofthe baseband signal.

Further, the wireless transceiver 210 up-converts the baseband signalinto a radio frequency (RF) band signal to transmit the RF band signalthrough an antenna, and it down-converts the RF band signal receivedthrough the antenna into a baseband signal. For this, the wirelesstransceiver 210 may include a transmission filter, a reception filter,an amplifier, a mixer, an oscillator, a digital-to-analog converter(DAC), and an analog-to-digital converter (ADC). Further, the wirelesstransceiver 210 may include a plurality of transmission/reception paths.Further, the wireless transceiver 210 may include at least one antennaarray composed of a plurality of antenna elements.

From the viewpoint of hardware, the wireless transceiver 210 may becomposed of a digital unit and an analog unit, and the analog unit maybe composed of a plurality of sub-units in accordance with an operationpower and an operation frequency. The digital unit may be implemented byat least one processor (e.g., digital signal processor (DSP)).

As described above, the wireless transceiver 210 transmits and receivesa signal. Accordingly, the whole or a part of the wireless transceiver210 may be called a transmitter, a receiver, or a transceiver. Further,in the following description, it may be meant that the transmission andreception performed through the radio channel includes performing of theabove-described process by the wireless transceiver 210. According to anembodiment, the wireless transceiver 210 may include at least onetransceiver.

The backhaul communication unit 220 provides an interface for performingcommunication with other nodes in a network. That is, the backhaulcommunication unit 220 converts a bit string transmitted from the basestation to another node, for example, another access node, another basestation, a higher node, or a core network, and it converts a physicalsignal received from the other node into a bit string.

The memory 230 stores therein a base program for an operation of thebase station, an application program, and data of configurationinformation. The memory 230 may be composed of a volatile memory, anonvolatile memory, or a combination of the volatile memory and thenonvolatile memory. Further, the memory 230 provides the stored data inaccordance with a request from the controller 240. According to anembodiment, the memory 230 may include a memory.

The controller 240 controls the overall operations of the base station.For example, the controller 240 transmits and receives a signal throughthe wireless transceiver 210 or the backhaul communication unit 220.Further, the controller 240 records and writes data in the memory 230.Further, the controller 240 may perform protocol stack functionsrequired in the communication standards. According to anotherimplementation, the protocol stack may be included in the wirelesstransceiver 210. According to an embodiment, the controller 240 mayinclude at least one processor.

According to various embodiments, the controller 240 may perform acontrol operation so that the base station performs operations accordingto various embodiments to be described later. For example, thecontroller 240 may perform the channel access procedure for theunlicensed band. For example, the transceiver (e.g., wirelesstransceiver 210) may receive signals transmitted in the unlicensed band,and the controller 240 may determine whether the unlicensed band is inan idle state by comparing the intensity of the received signal with athreshold value predefined or determined by a value of a function havinga bandwidth as a factor. For example, the controller 240 may transmit acontrol signal to the terminal through the transceiver, or it mayreceive the control signal from the terminal. The controller 240 maydetermine the result of transmitting the signal to the terminal based onthe control signal or data signal received from the terminal. Forexample, the controller 240 may maintain or change a contention windowvalue for the channel access procedure (hereinafter referred to as“perform contention window adjustment”). According to variousembodiments, the controller 240 may determine a reference slot in orderto acquire the transmission result for the contention window adjustment.The controller 240 may determine a reference control channel for thecontention window adjustment in the reference slot. If it is determinedthat the unlicensed band is in an idle state, the controller 240 mayoccupy the channel.

FIG. 3 illustrates the configuration of a terminal in a wirelesscommunication system according to an embodiment of the disclosure. Theconfiguration exemplified in FIG. 3 may be understood as theconfiguration of the terminal 120. The term “˜unit” or “˜er”, as usedhereinafter, may mean a unit for processing at least one function oroperation, and it may be implemented by software, hardware, or acombination of the software and the hardware.

Referring to FIG. 3 , the terminal includes a transceiver 310, a memory320, and a controller 330.

The transceiver 310 performs functions for transmitting and receiving asignal through a radio channel. For example, the transceiver 310performs a conversion function between a baseband signal and a bitstring in accordance with physical layer standards of a system. Forexample, during data transmission, the transceiver 310 creates complexsymbols by encoding and modulating transmitted bit strings. Further,during data reception, the transceiver 310 restores the received bitstrings through demodulation and decoding of the baseband signal.Further, the transceiver 310 up-converts the baseband signal into an RFband signal to transmit the RF band signal through an antenna, and itdown-converts the RF band signal received through the antenna into abaseband signal. For example, the transceiver 310 may include atransmission filter, a reception filter, an amplifier, a mixer, anoscillator, a DAC, and an ADC.

Further, the transceiver 310 may include a plurality oftransmission/reception paths. Further, the transceiver 310 may includeat least one antenna array composed of a plurality of antenna elements.From the viewpoint of hardware, the transceiver 310 may be composed of adigital circuit and an analog circuit (e.g., radio frequency integratedcircuit (RFIC)). Here, the digital circuit and the analog circuit may beimplemented by one package. Further, the transceiver 310 may include aplurality of RF chains. Further, the transceiver 310 may performbeamforming.

As described above, the transceiver 310 transmits and receives a signal.Accordingly, the whole or a part of the transceiver 310 may be called atransmitter or a receiver. Further, in the following description, it maybe meant that the transmission and reception performed through the radiochannel includes performing of the above-described process by thetransceiver 310. According to an embodiment, the transceiver 310 mayinclude at least one transceiver.

The memory 320 stores therein a base program for an operation of theterminal, an application program, and data of configuration information.The memory 320 may be composed of a volatile memory, a nonvolatilememory, or a combination of the volatile memory and the nonvolatilememory. Further, the memory 320 provides the stored data in accordancewith a request from the controller 330. According to an embodiment, thememory 320 may include a memory.

The controller 330 controls the overall operations of the terminal. Forexample, the controller 330 transmits and receives a signal through thetransceiver 310. Further, the controller 330 records and writes data inthe memory 320. Further, the controller 330 may perform protocol stackfunctions required in the communication standards. For this, thecontroller 330 may include at least one processor or a microprocessor,or it may be a part of the processor. According to an embodiment, thecontroller 330 may include at least one processor. Further, according toan embodiment, a part of the transceiver 310 and/or the controller 330may be called a communication processor (CP).

According to various embodiments, the controller 330 may perform acontrol operation so that the terminal performs operations according tovarious embodiments to be described later. For example, the controller330 may receive a downlink signal (downlink control signal or downlinkdata) transmitted by the base station through the transceiver (e.g.,transceiver 310). For example, the controller 330 may determine theresult of transmitting the downlink data. The transmission result mayinclude feedback information on ACK, NACK, and DTX of the transmitteddownlink signal. In the disclosure, the transmission result may becalled various terms, such as a reception state of the downlink signal,reception result, decoding result, and HARQ-ACK information. Forexample, the controller 330 may transmit an uplink signal to the basestation through the transceiver as a response signal to the downlinksignal. The uplink signal may explicitly or implicitly include theresult of transmitting the downlink signal.

The controller 330 may perform the channel access procedure for theunlicensed band. For example, the transceiver (e.g., transceiver 310)may receive signals transmitted in the unlicensed band, and thecontroller 330 may determine whether the unlicensed band is in an idlestate by comparing the intensity of the received signal with a thresholdvalue predefined or determined by a value of a function having abandwidth as a factor. The controller 330 may perform an accessprocedure for the unlicensed band to transmit the signal to the basestation.

FIG. 4 illustrates the configuration of a communication unit in awireless communication system according to an embodiment of thedisclosure. FIG. 4 illustrates an example of a detailed configuration ofthe wireless transceiver 210 of FIG. 2 or the communication unit 310 ofFIG. 3 . Specifically, FIG. 4 exemplifies constituent elements forperforming beamforming as a part of the wireless transceiver 210 of FIG.2 or the communication unit 310 of FIG. 3 .

Referring to FIG. 4 , the wireless transceiver 210 or the transceiver310 includes an encoder and modulator 402, a digital beamformer 404, aplurality of transmission paths 406-1 to 406-N, and an analog beamformer408.

The encoder and modulator 402 performs channel encoding. For suchchannel encoding, at least one of a low density parity check (LDPC)code, a convolution code or a polar code. The encoder and modulator 402creates modulation symbols by performing constellation mapping.

The digital beamformer 404 performs beamforming for digital signals(e.g., modulation symbols). For this, the digital beamformer 404multiplies the modulation symbols by beamforming weights. Here, thebeamforming weight is used to change the level and the phase of thesignal, and it may be called a precoding matrix or precoder. The digitalbeamformer 404 outputs digitally beamformed modulation symbols to theplurality of transmission paths 406-1 to 406-N. In this case, inaccordance with a multiple input multiple output (MIMO) transmissiontechnique, the modulation symbols may be multiplexed, or the samemodulation symbols may be provided to the plurality of transmissionpaths 406-1 to 406-N.

The plurality of transmission paths 406-1 to 406-N converts thedigitally beamformed digital signals into analog signals. For this, eachof the plurality of transmission paths 406-1 to 406-N may include aninverse fast Fourier transform (IFFT) operation unit, a cyclic prefix(CP) insertion unit, a DAC, and an up-conversion unit. The CP insertionunit is for an orthogonal frequency division multiplexing (OFDM) scheme,and if a different physical layer scheme (e.g., filter bank multicarrier(FBMC)) is applied, the CP insertion unit may be omitted. That is, theplurality of transmission paths 406-1 to 406-N provide independentsignal processes with respect to a plurality of streams created throughthe digital beamforming. However, in accordance with implementationschemes, some constituent elements of the plurality of transmissionpaths 406-1 to 406-N may be commonly used.

The analog beamformer 408 performs beamforming for analog signals. Forthis, the analog beamformer 408 multiplies the analog signals bybeamforming weights. Here, the beamforming weight is used to change thelevel and the phase of the signal. Specifically, the analog beamformer408 may be variously configured in accordance with connection structuresbetween the plurality of transmission paths 406-1 to 406-N and antennas.For example, each of the plurality of transmission paths 406-1 to 406-Nmay be connected to one antenna array. As another example, the pluralityof transmission paths 406-1 to 406-N may be connected to one antennaarray. As still another example, the plurality of transmission paths406-1 to 406-N may be adaptively connected to one antenna array, or theymay be connected to two or more antenna arrays.

In a 5G system, it is necessary to flexibly define a frame structure inconsideration of various services and requirements. For example,respective services may have different subcarrier spacings in accordancewith the requirements. The 5G communication system currently supports aplurality of subcarrier spacings, and the subcarrier spacing may bedetermined by mathematical expression 1.

=

2^(m)  Mathematical expression 1

In the mathematical expression 1,

denotes a base subcarrier spacing of the system, m denotes a scalingfactor of an integer, and

denotes a subcarrier spacing. For example, if f₀ is 15 kHz, a subcarrierspacing set that the 5G communication system can have may be composed ofone of 3.75 kHz, 7.5 kHz, 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, and480 kHz. An available subcarrier spacing set may differ depending on thefrequency band. For example, in the frequency band that is equal to orlower than 6 GHz, 3.75 kHz, 7.5 kHz, 15 kHz, 30 kHz, and 60 kHz may beused, whereas in the frequency band that is higher than 6 GHz, 60 kHz,120 kHz, and 240 kHz may be used.

In various embodiments, the duration of the corresponding OFDM symbolmay differ depending on the subcarrier spacing constituting an OFDMsymbol. This is because, according to the feature of the OFDM symbol,the subcarrier spacing and the OFDM symbol duration are in a reciprocalrelationship with each other. For example, if the subcarrier spacing isincreased twice, the symbol duration is reduced to ½, and in contrast,if the subcarrier spacing is reduced to ½, the symbol duration islengthened twice.

FIG. 5 illustrates an example of a radio resource region in a wirelesscommunication system according to an embodiment of the disclosure. Invarious embodiments, the radio resource region may include a structureof a time-frequency region. In various embodiments, the wirelesscommunication system may include an NR communication system.

Referring to FIG. 5 , in the radio resource region, a horizontal axisrepresents a time domain, and a vertical axis represents a frequencydomain. In the time domain, the minimum transmission unit may be anorthogonal frequency division multiplexing (OFDM) and/or discreteFourier transform (DFT)-spread-OFDM (DFT-s-OFDM) symbol, and N_(symb)OFDM symbols 102 and/or DFT-s-OFDM symbols 501 may be gathered toconstitute one slot 502. In various embodiments, the OFDM symbols mayinclude symbols in case of transmitting/receiving signals using the OFDMmultiplexing scheme, and the DFT-s-OFDM symbols may include symbols incase of transmitting/receiving signals using DFT-s-OFDM or singlecarrier frequency division multiple access (SC-FDMA) multiplexingscheme. Hereinafter, in the disclosure, for convenience in explanation,an embodiment for OFDM symbols will be described, but such an embodimentis also applicable to an embodiment for DFT-s-OFDM symbols. Further,although an embodiment of the disclosure for OFDM symbols will bedescribed for convenience in explanation, such an embodiment may also beapplicable to an embodiment for DFT-s-OFDM symbols. Further, although anembodiment of the disclosure for downlink signal transmission andreception will be described for convenience in explanation, such anembodiment may also be applicable to an embodiment for uplink signaltransmission and reception.

If a subcarrier spacing (SCS) is 15 kHz, in contrast with thatillustrated in FIG. 5 , one slot 502 constitutes one subframe 503, andthe duration of the slot 502 or the subframe 503 may be 1 ms. In variousembodiments, the number of slots 502 that constitute one subframe 503and the duration of the slot 502 may differ in accordance with thesubcarrier spacing. For example, if the subcarrier spacing is 30 kHz,two slots 502 may constitute one subframe 503. In this case, theduration of the slot 502 is 0.5 ms, and the duration of the subframe 503is 1 ms. Further, a radio frame 504 may be a time domain interval thatis composed of 10 subframes. In the frequency domain, the minimumtransmission unit is a subcarrier, and the carrier bandwidth configuringa resource grid may be composed of N_(SC) ^(BW) subcarriers 505 intotal.

However, the subcarrier spacing, the number of slots 502 included in thesubframe 503, the duration of the slot 502, and the duration of thesubframe 503 may be variably applied. For example, in case of an LTEsystem, the subcarrier spacing is 15 kHz, and two slots constitute onesubframe 503. In this case, the duration of the slot 502 may be 0.5 ms,and the duration of the subframe 503 may be 1 ms. In another example, incase of an NR system, the subcarrier spacing p may be one of 15 kHz, 30kHz, 60 kHz, 120 kHz, and 240 kHz, and the number of slots included inone subframe in accordance with the subcarrier spacing p may be 1, 2, 4,8, or 16.

In the time-frequency domain, the basic unit of resources may be aresource element (RE) 506, and the resource element 506 may be expressedby an OFDM symbol index and a subcarrier index. In an LTE system, aresource block (RB) (or physical resource block (PRB)) may be defined byN_(symb) successive OFDM symbols in the time domain and N_(SC) ^(RB)successive subcarriers in the frequency domain. The number of symbolsincluded in one RB may be N_(symb)=14, the number of subcarriers may beN_(SC) ^(RB)=12, and the number of RBs (N_(RB)) may be changed inaccordance with the bandwidth of the system transmission band. In the NRsystem, the resource block (RB) 507 may be defined by N_(SC) ^(RB)successive subcarriers 508. The number of subcarriers may be N_(SC)^(RB)=12. The frequency domain may include common resource blocks(CRBs), and the physical resource block (PRB) may be defined in thebandwidth part (BWP) on the frequency domain. The numbers of CRB and PRBmay be differently determined in accordance with the subcarrier spacing.

Downlink control information may be transmitted in initial N OFDMsymbol(s) within the slot. In general, the number may be N={1, 2, 3},and a terminal may be configured with the number of symbols, in whichthe downlink control information can be transmitted through higher layersignaling, by a base station. Further, in accordance with the quantityof control information to be transmitted in the current slot, the basestation may change the number of symbols, in which the downlink controlinformation can be transmitted in the slot, for each slot, and it maytransfer information on the number of symbols to the terminal on aseparate downlink control channel.

In the NR and/or LTE system, scheduling information on downlink data oruplink data may be transferred from the base station to the terminalthrough downlink control information (DCI). In various embodiments, theDCI may be defined in accordance with various formats, and each formatmay indicate whether the DCI includes scheduling information on theuplink data (e.g., UL grant) or scheduling information on the downlinkdata (DL grant), whether the DCI is a compact DCI having small-sizedcontrol information or a fall-back DCI, whether spatial multiplexingusing multiple antennas is applied, and/or whether the DCI is a DCI forpower control.

For example, a DCI format that is the scheduling control information onthe downlink data (DL grant) (e.g., DCI format 1_0 of the NR) mayinclude at least one of the following control information.

-   -   Control information (DCI) format identifier: This is an        identifier for identifying a DCI format.    -   Frequency domain resource assignment: This indicates RBs        allocated for data transmission.    -   Time domain resource assignment: This indicates slots and        symbols allocated for data transmission.    -   VRB-to-PRB mapping: This indicates whether to apply a virtual        resource block (BRB) mapping scheme.    -   Modulation and coding scheme (MCS): This indicates a modulation        scheme used for data transmission and the size of a transport        block (TB) that is data intended to be transmitted.    -   New data indicator: This indicates whether an HARQ is initially        transmitted or retransmitted.    -   Redundancy version: This indicates a redundancy version of an        HARQ.    -   HARQ process number: This indicates the process number of an        HARQ.    -   PDSCH assignment information (downlink assignment index): This        indicates the number of PDSCH reception results (e.g., the        number of HARQ-ACKs) to be reported from a terminal to a base        station.    -   Transmit power control (TCP) command for a physical uplink        control channel (PUCCH): This indicates a transmit power control        command for a PUCCH that is an uplink control channel.    -   PUCCH resource indicator: This indicates PUCCH resources used to        report an HARQ-ACK including the reception result for a PDSCH        configured through corresponding DCI.    -   PUCCH transmit timing indicator (PDSCH-to-HARQ_feedback timing        indicator): This indicates slot or symbol information in which a        PUCCH for HARQ-ACK report including the reception result for a        PDSCH configured through corresponding DCI should be        transmitted.

The DCI may pass through a channel coding and modulation process, and itmay be transmitted on a physical downlink control channel (PDCCH) thatis a downlink physical control channel (or control information,hereinafter being interchangeably used) or an enhanced PDCCH (EPDCCH)(or enhanced control information, hereinafter being interchangeablyused). Hereinafter, transmission/reception of the PDCCH or EPDCCH may beunderstood as DCI transmission/reception on the PDCCH or EPDCCH, andtransmission/reception of the physical downlink shared channel (PDSCH)may be understood as downlink data transmission/reception on the PDSCH.

In various embodiments, a cyclic redundancy check (CRC) scrambled with aspecific radio network temporary identifier (RNTI) (or terminalidentifier (C-RNTI (Cell-RNTI)) that is independent with respect to eachterminal may be added to the DCI, and the DCI for each terminal may bechannel-coded and then is configured and transmitted on the independentPDCCH. In the time domain, the PDCCH may be transmitted at a controlchannel transmission interval. In the frequency domain, the PDCCHmapping location may be determined by at least an identifier (ID) ofeach terminal, and it may be transmitted in the whole systemtransmission band or in a configured frequency band of the systemtransmit band. Further, in the frequency domain, the PDCCH mappinglocation may be configured by higher layer signaling.

The downlink data may be transmitted on a physical downlink sharedchannel (PDSCH) that is a physical channel for transmitting the downlinkdata. The PDSCH may be transmitted after the control channeltransmission interval, and in the frequency domain, schedulinginformation, such as a PDSCH mapping location and a PDSCH modulationscheme, may be determined based on the DCI transmitted on the PDCCH.

Through the modulation and coding scheme (MCS) among the controlinformation constituting the DCI, the base station may notify theterminal of the modulation scheme applied to the PDSCH to be transmittedand the transport block size (TBS) of the data to be transmitted. Invarious embodiments, the MCS may be composed of 5 bits or more or less.The TBS corresponds to the size of the data (transport block (TB)) thatthe base station intends to transmit before the channel coding for errorcorrection is applied to the TB.

In the NR system, the modulation scheme supported for uplink anddownlink data transmission may include at least one of quadrature phaseshift keying (QPSK), 16 quadrature amplitude modulation (16 QAM), 64QAM, or 256 QAM, and respective modulation orders Q_(m) may be 2, 4, 6,and 8. That is, in case of the QPSK modulation, 2 bits per symbol may betransmitted, and in case of the 16 QAM modulation, 4 bits per symbol maybe transmitted. Further, in case of the 64 QAM modulation, 6 bits persymbol may be transmitted, and in case of the 256 QAM modulation, 8 bitsper symbol may be transmitted. Further, in accordance with the systemmodification, a modulation scheme over the 256 QAM may be used.

In case of a system that performs communication in an unlicensed band, acommunication device (base station or terminal) that intends to transmita signal through the unlicensed band may perform a channel accessprocedure or listen-before talk (LBT) for the unlicensed band intendedto perform communication before the signal is transmitted, and if it isdetermined that the unlicensed band is in an idle state in accordancewith the channel access procedure, the communication device may performthe signal transmission by accessing the unlicensed band. If it isdetermined that the unlicensed band is not in the idle state inaccordance with the performed channel access procedure, thecommunication device may not perform the signal transmission.

The channel access procedure in the unlicensed band may be discriminateddepending on whether the start time of the channel access procedure ofthe communication device is fixed (frame-based equipment (FBE)) or isvariable (load-based equipment (LBE)). In addition to the start time ofthe channel access procedure, the communication device may be determinedas an FBE device or an LBE device depending on whether thetransmit/receive structure of the communication device has one period ordoes not have the period. Here, the fact that the start time of thechannel access procedure is fixed means that the channel accessprocedure of the communication device may start periodically inaccordance with a predefined period or a period declared or configuredby the communication device. As another example, the fact that the starttime of the channel access procedure is fixed may mean that thetransmission or reception structure of the communication device has oneperiod. Here, the fact that the start time of the channel accessprocedure is variable means that the channel access procedure of thecommunication device can start any time when the communication deviceintends to transmit the signal through the unlicensed band. As stillanother example, the fact that the start time of the channel accessprocedure is variable means that the transmission or reception structureof the communication device does not have one period, but it may bedetermined as needed.

Hereinafter, the channel access procedure (hereinafter, traffic-basedchannel access procedure or LBE-based channel access procedure) in casethat the start time of the channel access procedure of the communicationdevice is variable (load-based equipment (LBE)) will be described.

The channel access procedure in the unlicensed band may include aprocedure of determining an idle state of the unlicensed band bymeasuring the intensity of the signal being received through theunlicensed band for a fixed time or a time calculated in accordance witha predefined rule (e.g., time calculated through at least one randomvalue selected by the base station or the terminal), and comparing themeasured signal intensity with a predefined threshold value or athreshold value that is calculated by a function of determining theintensity level of the received signal in accordance with at least onevariable among a channel bandwidth, a signal bandwidth in which a signalintended to be transmitted is transmitted, and/or a transmission powerintensity.

For example, the communication device may measure the signal intensityfor X μs (e.g., 25 μs) immediately before the time when the signal istransmitted, and if the measured signal intensity is lower than apredefined or calculated threshold value T (e.g., −72 dBm), thecommunication device may determine that the unlicensed band is in anidle state, and it may transmit the configured signal. In this case, themaximum time when successive signal transmission is possible after thechannel access procedure may be limited depending on the maximum channeloccupancy time defined for each country, area, or frequency band inaccordance with each unlicensed band, and it may also be limiteddepending on the kind of the communication device (e.g., base station orterminal, or master or slave). For example, in case of Japan, in the 5GHz unlicensed band, a base station or a terminal may transmit a signalby occupying a channel with respect to an unlicensed band that isdetermined to be in an idle state after performing the channel accessprocedure without performing an additional channel access procedure forthe maximum time of 4 ms.

More specifically, in case where the base station or the terminalintends to transmit a downlink or uplink signal using the unlicensedband, the channel access procedure that can be performed by the basestation or the terminal may be discriminated into at least the followingtypes.

-   -   Type 1: It transmits an uplink/downlink signal after performing        the channel access procedure for a variable time.    -   Type 2: It transmits an uplink/downlink signal after performing        the channel access procedure for a fixed time.    -   Type 3: It transmits an uplink or downlink signal without        performing the LBT procedure for determining channel occupancy        by another node in the channel access procedure.

A transmission device (e.g., base station or terminal) that intends totransmit a signal in an unlicensed band may determine the type of thechannel access procedure in accordance with the kind of the signal to betransmitted. In the 3rd Generation Partnership Project (3GPP), the LBTprocedure that is the channel access scheme may be divided into fourcategories. The four categories may include a first category in whichthe LBT is not performed, a second category in which the LBT isperformed without random backoff, a third category in which the LBT isperformed through the random backoff in a contention window of a fixedsize, and a fourth category in which the LBT is performed through therandom backoff in a contention window of a variable size. According toan embodiment, in case of type 1, the third and fourth categories may beexemplified, and in case of type 2, the second category may beexemplified. Further, in case of type 3, the first category may beexemplified.

In the disclosure, for convenience in explanation, it may be assumedthat the transmission device is the base station, and the transmissiondevice and the base station may be interchangeably used.

For example, in case that the base station intends to transmit adownlink signal including a downlink data channel in the unlicensedband, the base station may perform the channel access procedure oftype 1. Further, in case that the base station intends to transmit adownlink signal that does not include a downlink data channel in theunlicensed band, for example, in case that the base station intends totransmit a synchronization signal or a downlink control channel, thebase station may perform the channel access procedure of type 2, and itmay transmit a downlink signal.

In this case, the type of the channel access procedure may be determinedin accordance with the transmission interval of the signal intended tobe transmitted in the unlicensed band, the time for occupying and usingthe unlicensed band, or the size of a spacing. In general, in type 1,the channel access procedure may be performed for a longer time than thetime when the channel access procedure is performed in type 2.Accordingly, if the communication device intends to transmit the signalfor a short duration or for a time that is equal to or shorter than areference time (e.g., X ms or Y symbols), the channel access procedureof type 2 may be performed. In contrast, in case that the communicationdevice intends to transmit the signal for a long duration or for a timethat exceeds the reference time (e.g., X ms or Y symbols), the channelaccess procedure of type 1 may be performed. In other words, inaccordance with the usage time of the unlicensed band, different typesof channel access procedures may be performed.

In case that the transmission device performs the channel accessprocedure of type 1 in accordance with at least one of theabove-described references, the transmission device that intends totransmit the signal in the unlicensed band may determine a channelaccess priority class (or channel access priority) in accordance with aquality of service class identifier (QCI) of the signal intended to betransmitted in the unlicensed band, and it may perform the channelaccess procedure using at least one of predefined configuration valuesas in Table 1 with respect to the determined channel access priorityclass. Table 1 below shows a mapping relationship between the channelaccess priority class and the QCI.

For example, QCI 1, 2, or 4 may mean a QCI value for a service, such asconversational voice, conversational video (live streaming), ornon-conversational video (buffered streaming). If it is intended totransmit the signal for the service that does not match the QCI of Table1 in the unlicensed band, the transmission device may select the QCIthat is closest to the QCI of Table 1, and it may select the channelaccess priority class for the selected QCI.

TABLE 1 Channel Access Priority QCI 1 1, 3, 5, 65, 66, 69, 70 2 2, 7 34, 6, 8, 9 4 —

In various embodiments, parameter values for the channel access priorityclass (e.g., defer duration in accordance with a determined channelaccess priority p, a set CW_(p) of contention window values or sizes,and minimum and maximum values CW_(min,p) and CW_(max,p) of thecontention window, and the maximum channel occupancy possible durationT_(mcot,p)) may be determined as in Table 2. Table 2 shows parametervalues for the channel access priority class in case of a downlink.

FIG. 6 is a diagram illustrating an example of a channel accessprocedure in an unlicensed band in a wireless communication systemaccording to an embodiment of the disclosure. A situation in which abase station performs a channel access procedure for occupying anunlicensed band will be described. The base station 110 of FIG. 1 isexemplified as the base station.

Referring to FIG. 6 , the base station that intends to transmit adownlink signal in the unlicensed band may perform the channel accessprocedure for the unlicensed band for the minimum time ofT_(f)+m_(p)*T_(sl) (e.g., defer duration 612 of FIG. 6 ). If the basestation intends to perform the channel access procedure with the channelaccess priority class 3 (p=3), the size of T_(f)+m_(p)*T_(sl) may beconfigured using m_(p)=3 with respect to the defer duration sizeT_(f)+m_(p)*T_(sl) that is necessary to perform the channel accessprocedure. Here, T_(f) is a value fixed to 16 μs (e.g., duration 610 ofFIG. 6 ), and the initial time T_(sl) should be in an idle state, and atthe remaining time T_(f)-T_(sl) after the time T_(sl) among the timeT_(f), the base station may not perform the channel access procedure. Inthis case, even if the base station has performed the channel accessprocedure at the remaining time T_(f)-T_(sl), the result of the channelaccess procedure may not be used. In other words, the time T_(f)-T_(sl)is the time when the base station defers the performing of the channelaccess procedure.

If it is determined that the unlicensed band is in the idle state at allthe time m_(p)*T_(sl), the number N may be N=N−1. In this case, thenumber N may be selected as a certain integer value among values between0 and the contention window value CW_(p) at the time when the channelaccess procedure is performed. In case of the channel access priorityclass 3, the minimum contention window value and the maximum contentionwindow value are 15 and 63, respectively. If it is determined that theunlicensed band is in the idle state in the defer duration and anadditional duration when the channel access procedure is performed, thebase station may transmit the signal through the unlicensed band for thetime T_(mcot,p) (8 ms). Meanwhile, Table 2 shows channel access priorityclasses (or channel access priorities) in a downlink. In the disclosure,for convenience in explanation, embodiments are described based on thedownlink channel access priority classes. In case of an uplink, thechannel access priority classes in Table 2 may be used in the samemanner, or separate channel access priority classes for the uplinktransmission may be used.

TABLE 2 Channel Access Priority allowed Class (p) m_(p) CW_(min,p)CW_(max,p) T_(mcot,p) CW_(p) sizes 1 1  3    7 2 ms {3,7} 2 1  7   15 3ms {7,15} 3 3 15   63 8 or 10 ms {15, 31, 63} 4 7 15 1023 8 or 10 ms{15, 31, 63, 127, 255, 511, 1023}

The initial contention window value CW_(p) is the minimum contentionwindow value CW_(min,p). The base station having selected the value Nmay perform the channel access procedure in the duration T_(sl) (e.g.,slot duration 620 of FIG. 6 ), and if it is determined that theunlicensed band is in the idle state through the channel accessprocedure performed in the duration T_(sl), the base station may changethe value N to N=N−1. In case of N=0, the base station may transmit thesignal through the unlicensed band for the maximum time T_(mcot,p)(e.g., maximum occupancy time 630 of FIG. 6 ). If the unlicensed bandthat is determined through the channel access procedure at the time Tiis not in the idle state, the base station may re-perform the channelaccess procedure without changing the value N. The size of thecontention window value CW_(p) may be changed or maintained inaccordance with the ratio Z of the NACK among the reception resultsACK/NACK for the downlink data (i.e., downlink data received in areference subframe or reference slot or reference transmit time interval(reference TTI)) which one or more terminals having received thedownlink data transmitted through the downlink data channel (PDSCH 662)and the downlink control information transmitted through the downlinkcontrol channel (PDCCH 660) in the reference subframe or reference slotor reference transmit time interval (reference TTI) have transmitted orreported to the base station. In this case, the reference subframe orreference slot or reference transmit time interval (reference TTI) maybe determined as the first subframe or slot or transmit time interval(TTI) of the downlink signal transmission interval (or the maximumchannel occupancy time (MCOT)) that the base station has transmittedmost recently through the unlicensed band at the time when the basestation starts the channel access procedure, at the time when the basestation selects the value N in order to perform the channel accessprocedure, or immediately before the two time points, or the startsubframe or start slot or start transmission interval of thetransmission interval.

With reference to FIG. 6 , the base station may attempt the channelaccess in order to occupy the unlicensed band. The first slot (or startslot starting the channel occupancy time) or subframe or transmissioninterval 640 of the downlink signal transmission interval (channeloccupancy time (hereinafter, COT) 630), which the base station hastransmitted most recently through the unlicensed band at the time 670when the base station starts the channel access procedure, at the timewhen the base station selects the value N in order to perform thechannel access procedure, or immediately before the time points, may bedefined as the reference slot or reference subframe or referencetransmission interval. For convenience in explanation, this ishereinafter expressed as the reference slot. Specifically, one or moresuccessive slots including the first slot in which the signal istransmitted among the entire slots of the downlink signal transmissioninterval 630 may be defined as the reference slot. Further, according toan embodiment, if the downlink signal transmission interval starts afterthe first symbol of the slot, the slot in which the downlink signaltransmission starts and the next slot may be defined as the referenceslot. In the reference slot, if the ratio of the NACK is equal to orhigher than Z among the reception results for the downlink data that oneor more terminals having received the downlink data transmitted throughthe downlink data channel in the reference slot have transmitted orreported to the base station, the base station may determine thecontention window value or size being used in the channel accessprocedure 670 of the corresponding base station as the contention windowvalue or size that is larger than the contention window value or sizeused in the previous channel access procedure 602. In other words, thebase station may increase the size of the contention window used in thechannel access procedure 602. The base station may perform the nextchannel access procedure 670 by selecting the value N 633 within a rangedefined in accordance with the contention window having the increasedsize.

If the base station is unable to acquire the reception result for thedownlink data channel transmitted by the base station in the referenceslot of the transmission interval 630, for example, if the time intervalbetween the reference slot and the time 670 when the base station startsthe channel access procedure is equal to or less than n slots or symbols(in other words, if the base station starts the channel access procedurebefore the minimum time when the terminal can report, to the basestation, the result of receiving the downlink data channel transmittedin the reference slot), the first slot of the latest downlink signaltransmission interval transmitted before the downlink signaltransmission interval 630 may become the reference slot.

In other words, if the base station is unable to receive the result ofreceiving the downlink data transmitted from the terminal at the time670 when the base station starts the channel access procedure, or at thetime when the base station selects the value N to perform the channelaccess procedure, or immediately before the time points, the basestation may determine the contention window using the result ofreceiving the downlink data of the terminal for the reference slot inthe most recently transmitted downlink signal transmission intervalamong the results of receiving the downlink data channel alreadyreceived from the terminals. Further, the base station may determine thecontention window size that is used in the channel access procedure 670using the results of receiving the downlink data received from theterminals with respect to the downlink data transmitted on the downlinkdata channel in the reference slot.

For example, if 80% or more of the results of receiving the downlinkdata transmitted to the terminal on the downlink data channel in thereference slot among the downlink signals transmitted through theunlicensed band is determined as the NACK, the base station, havingtransmitted the downlink signal through the channel access procedure(e.g., CW_(p)=15) that is configured in accordance with the channelaccess priority class 3 (p=3), may increase the contention window fromthe initial value (CW_(p)=15) to the next contention window value(CW_(p)=31). The ratio value of 80% is exemplary, and variousmodifications thereof are possible.

If 80% or more of the reception results of the terminal is notdetermined as the NACK, the base station may maintain the contentionwindow value as the existing value or it may change the contentionwindow value to the initial value. In this case, the change of thecontention window may be commonly applied to all the channel accesspriority classes, or it may be applied only to the channel accesspriority classes used in the channel access procedure. In this case, amethod for determining the reception result that is effective to thedetermination of the change of the contention window size among thereception results for the downlink data that the terminal hastransmitted or reported to the base station with respect to the downlinkdata transmitted on the downlink data channel in the reference slot inwhich the change of the contention window size is determined, in otherwords, a method for determining the value Z, is as follows.

In case that the base station transmits one or more codewords (CWs) orTBs to one or more terminals in the reference slot, the base station maydetermine the value Z by the ratio of the NACK among the receptionresults transmitted or reported by the terminal with respect to the TBreceived by the terminal in the reference slot. For example, if twocodewords or two TBs are transmitted to one terminal in the referenceslot, the base station may receive, from the terminal, (a report of) theresult of receiving the downlink data signal for two TBs. If the ratio Zof the NACK of the two reception results is predefined or is equal to orhigher than a threshold value (e.g., Z=80%) configured between the basestation and the terminal, the base station may change or increase thecontention window size.

In this case, if the terminal transmits or reports the result ofreceiving the downlink data for one or more slots (e.g., M slots)including the reference slot to the base station through bundling, thebase station may determine that the terminal has transmitted the Mreception results. Further, the base station may determine the value Zas the ratio of the NACK among the M reception results, and it maychange, maintain, or initialize the contention window size.

If the reference slot corresponds to the second slot of two slotsincluded in one subframe, or if the downlink signal is transmitted fromthe symbol after the first symbol in the reference slot, the referenceslot and the next slot may be determined as the reference slot, and thevalue Z may be determined as the ratio of the NACK among the receptionresults that the terminal transmits or reports to the base station withrespect to the downlink data received in the reference slot.

Further, the base station may determine the value Z by determining thereception result of the terminal as the NACK if scheduling informationor downlink control information for the downlink data channeltransmitted by the base station is transmitted from the cell or thefrequency band that is equal to the cell or the frequency band in whichthe downlink data channel is transmitted, if scheduling information ordownlink control information for the downlink data channel transmittedby the base station is transmitted through the unlicensed band or fromthe cell or the frequency band that is different from the cell or thefrequency band in which the downlink data channel is transmitted, if itis determined that the terminal does not transmit the reception resultfor the downlink data received in the reference slot, or if it isdetermined that the reception result for the downlink data transmittedby the terminal is at least one of discontinuous transmission (DTX),NACK/DTX, or any state.

Further, if it is determined that the reception result for the downlinkdata transmitted by the terminal is at least one of the DTX, NACK/DTX,or any state in case that the scheduling information or downlink controlinformation for the downlink data channel transmitted by the basestation is transmitted through a licensed band, the base station may notreflect the reception result of the terminal in the reference value Z ofthe contention window variation. In other words, the base station maydetermine the value Z through disregarding of the reception result ofthe terminal.

Further, if the base station transmits the scheduling information ordownlink control information for the downlink data channel through thelicensed band, or if the base station does not actually transmit thedownlink data (no transmission) among the reception results for thedownlink data for the reference slot that the terminal has transmittedor reported to the base station, the base station may determine thevalue Z through disregarding of the reception result transmitted orreported by the terminal with respect to the downlink data.

Hereinafter, the channel access procedure in case that the start time ofthe channel access procedure of the communication device is fixed(frame-based equipment (FBE)) (hereinafter, frame-based channel accessprocedure or FBE-based channel access procedure) will be described usingFIG. 7 .

FIG. 7 illustrates another example of a channel access procedure in anunlicensed band in a wireless communication system according to anembodiment of the disclosure.

Referring to FIG. 7 , a communication device that performs a frame-basedchannel access procedure may periodically transmit and receive signalsin accordance with a fixed frame period (FFP). Here, the fixed frameperiod 700 may be declared or configured by the communication device(e.g., base station), and it can be configured in the range of 1 ms to10 ms. In this case, the channel access procedure for the unlicensedband (or clear channel access (CCA)) may be performed immediately beforethe start of each frame period 730, 733, and 736, and in the same manneras the above-described channel access procedure of type 2, the channelaccess procedure may be performed for a fixed time or for oneobservation slot. If the unlicensed band is in an idle state as theresult of the channel access procedure or if it is determined that theunlicensed band is in the idle state, the communication device maytransmit and receive signals (740, 745) without performing a separatechannel access procedure for maximally 95% of the fixed frame period 700(hereinafter, channel occupancy time (COT) 710). In this case, minimally5% of the fixed frame period 700 is an idle time 720 for which thesignals are unable to be transmitted or received, and the channel accessprocedure may be performed within the idle time 720.

The frame-based channel access procedure has the advantage that it isrelatively simpler than the traffic-based channel access procedure, andit can periodically perform the channel access of the unlicensed band.However, because the start time of the channel access procedure isfixed, the probability to be able to access the unlicensed band may bedecreased in comparison to the traffic-based channel access procedure.

FIG. 8 is a diagram illustrating an example of scheduling and feedbackin a wireless communication system according to an embodiment of thedisclosure. A base station may transmit control information includingdownlink and/or uplink scheduling to a terminal. The base station maytransmit downlink data to the terminal. The terminal may transmitHARQ-ACK information that is a feedback of the downlink data to the basestation. Further, the terminal may transmit uplink data to the basestation. In an NR system, an uplink and downlink HARQ scheme may includean asynchronous HARQ scheme in which a data retransmission time is notfixed. For example, in case of a downlink, if the base station receivesa feedback of HARQ NACK from the terminal with respect to initiallytransmitted data, the base station may freely determine the transmissiontime of retransmitted data in accordance with a scheduling operation.The terminal may perform buffering of the data that is determined as anerror as the result of decoding the received data for the HARQoperation, and then the terminal may perform combining of the buffereddata with the data retransmitted from the base station. The base stationexemplifies the base station 110 of FIG. 1 . The terminal exemplifiesthe terminal 120 or the terminal 130 of FIG. 1 .

Referring to FIG. 8 , resource regions on which data channels aretransmitted in a 5G or NR communication system. A terminal may monitorand/or search for a PDCCH 810 in a downlink control channel(hereinafter, PDCCH) region (hereinafter, control resource set (CORESET)or search space (SS)). In this case, the downlink control channel regionmay be composed of information of a time domain 814 and a frequencydomain 812, and the information of the time domain 814 may be configuredin the unit of a symbol, whereas the information of the frequency domain812 may be configured in the unit of an RB or an RB group.

If the terminal detects the PDCCH 810 in slot i 800, the terminal mayacquire downlink control information (DCI) transmitted on the detectedPDCCH 810. Through the received downlink control information (DCI), theterminal may acquire scheduling information on a downlink data channelor an uplink data channel 840. In other words, the DCI may include atleast resource region (or PDSCH transmission region) information onwhich the terminal should receive the downlink data channel(hereinafter, PDSCH) transmitted from the base station or resourceregion information that the terminal is allocated with from the basestation for uplink data channel (PUSCH) transmission.

A case where the terminal is scheduled with the uplink data channel(PUSCH) transmission will be described as an example. The terminalhaving received the DCI may acquire a slot index or offset information Krequired to receive the PUSCH through the DCI, and it may determine aPUSCH transmission slot index. For example, the terminal may determineto be scheduled to transmit the PUSCH in slot i+K 805 through thereceived offset information K based on the slot index i 800 havingreceived the PDCCH 810. In this case, the terminal may determine sloti+K 805 or a PUSCH start symbol or time in the slot i+K through thereceived offset information K based on the CORESET having received thePDCCH 810.

Further, the terminal may acquire information on a PUSCH transmissiontime-frequency resource region 840 in the PUSCH transmission slot 805through the DCI. The PUSCH transmission frequency resource regioninformation 830 may include a physical resource block (PRB) or groupunit information of the PRB. Meanwhile, the PUSCH transmission frequencyresource region information 830 may be information on a region includedin an initial uplink bandwidth (BW) or an initial uplink bandwidth part(BWP) 835 that is determined or configured through the initial accessprocedure for the terminal. If the terminal is configured with theuplink bandwidth (BW) or the uplink bandwidth part (BWP) through ahigher signal, the PUSCH transmission frequency resource regioninformation 830 may be information about the region included in theuplink bandwidth (BW) or the uplink bandwidth part (BWP) configuredthrough the higher signal.

In various embodiments, PUSCH transmission time resource regioninformation 825 may be a symbol or symbol group unit information, or itmay be information indicating absolute time information. The PUSCHtransmission time resource region information 825 may be expressed as acombination of a PUSCH transmission start time or the symbol and theduration of the PUSCH or PUSCH end time or the symbol, and it may beincluded in the DCI as one field or value. The terminal may transmit thePUSCH on the PUSCH transmission resource region 840 determined throughthe DCI.

In various embodiments, the terminal having received the PDSCH 840 mayreport (feedback) the reception result for the PDSCH 840 (e.g.,HARQ-ACK/NSCK) to the base station. In this case, the transmissionresource of the uplink control channel (PUCCH) 870 for transmitting thereception result for the PDSCH 840 may be determined by the terminalbased on a PDSCH-to-HARQ timing indicator indicated through the DCI ofthe PDCCH 810 for scheduling the PDSCH 840 and a PUCCH resourceindicator. In other words, the terminal having received thePDSCH-to-HARQ timing indicator K1 through the DCI of the PDCCH 810 maytransmit the PUCCH 870 in the slot i+K+K1 850 after K1 from thereception slot 805 of the PDSCH 840. In this case the uplink controlchannel region may be composed of information of a time domain 874 and afrequency domain 872.

The base station may configure one or more values K1 to the terminalthrough higher layer signaling or it may indicate a specific value K1 tothe terminal through the DCI as described above. The value K1 may bedetermined in accordance with the HARQ-ACK processing capability of theterminal, in other words, in accordance with the minimum time requiredfor the terminal to receive the PDSCH and to create and report theHARQ-ACK for the PDSCH. Further, the terminal may use a predefined valueor a default value as the value K1 until the terminal is configured withthe value K1.

In this case, the PUCCH 870 transmission resource in the PUCCHtransmission slot 850 may be indicated through the PUCCH resourceindicator of the DCI, and the terminal may perform the PUCCHtransmission on the indicated resource. In this case, if transmission ofa plurality of PUCCHs is configured or indicated in the PUCCHtransmission slot 850, the terminal may perform the PUCCH transmissionon the PUCCH resource except the resource indicated through the PUCCHresource indicator of the DCI of the PDCCH 810.

In the 5G communication system, in order to dynamically change intervalsof downlink signal transmission and uplink signal transmission in a timedivision duplex (TDD) system, it may be indicated by a slot formatindicator (SFI) whether respective OFDM symbols constituting one slotare downlink symbols, uplink symbols, or flexible symbols. Here, thesymbols indicated as flexible symbols may be neither of the downlink anduplink symbols or may be symbols that can be changed to the downlink oruplink symbols by UE-specific control information or schedulinginformation. In this case, the flexible symbol may include a gap guardthat is necessary in a process of changing from the downlink to theuplink.

The slot format indicator may be simultaneously transmitted to aplurality of terminals through terminal group (or cell) common controlchannels. In other words, the slot format indicator may be transmittedon the PDCCH that is CRC-scrambled with an identifier (e.g., SF-RNTI)that is different from the terminal unique identifier (C-RNTI(cell-RNTI)). In various embodiments, the slot format indicator mayinclude information on N slots, and the value N may be an integer or anatural number value that is larger than 0, or it may be a value thatthe base station configures to the terminal through the higher signalfrom a set of predefined possible values, such as 1, 2, 5, 10, and 20.Further, the size of the slot format indicator information may beconfigured by the base station to the terminal through the highersignal. An example of the slot format that can be indicated by the slotformat indicator is indicated as in Table 3.

TABLE 3 Symbol numbers (or indexes) in one slot Format 0 1 2 3 4 5 6 7 89 10 11 12 13 0 D D D D D D D D D D D D D D 1 U U U U U U U U U U U U UU 2 F F F F F F F F F F F F F F 3 D D D D D D D D D D D D D F 4 D D D DD D D D D D D D F F 5 D D D D D D D D D D D F F F 6 D D D D D D D D D DF F F F 7 D D D D D D D D D F F F F F 8 F F F F F F F F F F F F F U 9 FF F F F F F F F F F F U U 10 F U U U U U U U U U U U U U 11 F F U U U UU U U U U U U U 12 F F F U U U U U U U U U U U 13 F F F F U U U U U U UU U U 14 F F F F F U U U U U U U U U 15 F F F F F F U U U U U U U U 16 DF F F F F F F F F F F F F 17 D D F F F F F F F F F F F F 18 D D D F F FF F F F F F F F 19 D F F F F F F F F F F F F U 20 D D F F F F F F F F FF F U 21 D D D F F F F F F F F F F U 22 D F F F F F F F F F F F U U 23 DD F F F F F F F F F F U U 24 D D D F F F F F F F F F U U 25 D F F F F FF F F F F U U U 26 D D F F F F F F F F F U U U 27 D D D F F F F F F F FU U U 28 D D D D D D D D D D D D F U 29 D D D D D D D D D D D F F U 30 DD D D D D D D D D F F F U 31 D D D D D D D D D D D F U U 32 D D D D D DD D D D F F U U 33 D D D D D D D D D F F F U U 34 D F U U U U U U U U UU U U 35 D D F U U U U U U U U U U U 36 D D D F U U U U U U U U U U 37 DF F U U U U U U U U U U U 38 D D F F U U U U U U U U U U 39 D D D F F UU U U U U U U U 40 D F F F U U U U U U U U U U 41 D D F F F U U U U U UU U U 42 D D D F F F U U U U U U U U 43 D D D D D D D D D F F F F U 44 DD D D D D F F F F F F U U 45 D D D D D D F F U U U U U U 46 D D D D D DF U D D D D F U 47 D D F U U U U D D F U U U U 48 D F U U U U U D F U UU U U 49 D D D D F F U D D D D F F U 50 D D F F U U U D D F F U U U 51 DF F U U U U D F F U U U U 52 D F F F F F U D F F F F F U 53 D D F F F FU D D F F F F U 54 F F F F F F F D D D D D D D 55 D D F F F U U U D D DD D D 56-254 Reserved 255 UE determines the slot format for the slotbased on TDD-UL-DL- ConfigurationCommon, or TDD-UL-DL-ConfigDedicatedand, if any, on detected DCI formats

In Table 3, D means a downlink, U means an uplink, and F means aflexible symbol. According to Table 3, the total number of supportableslot formats is 256. In the current NR system, the maximum size of theslot format indicator information bits is 128 bits, and the slot formatindicator information bit is a value that the base station can configureto the terminal through a higher signal (e.g., dci-PayloadSize).

In various embodiments, the slot format indicator information mayinclude slot formats for a plurality of serving cells, and the slotformats for the respective serving cells may be discriminated from eachother through serving cell IDs. Further, a slot format combination ofslot format indicators for one or more slots may be included for eachserving cell. For example, if the size of the slot format indicatorinformation bits is 3 bits, and the slot format indicator information iscomposed of slot format indicators for one serving cell, the 3-bit slotformat indicator information may be composed of eight slot formatindicators or a slot formation indicator combination (hereinafter, slotformat indicator) in total, and the base station may indicate one of theeight slot format indicators through terminal group common controlinformation (group common DCI) (hereinafter, slot format indicatorinformation).

In various embodiments, at least one of the 8 slot format indicators maybe composed of a slot format indicator for a plurality of slots. Forexample, Table 4 shows an example of 3-bit slot format indicatorinformation composed of slot formats of Table 3. Five slot formatindicators (slot format combination IDs 0, 1, 2, 3, and 4) of the slotformat indicator information may be slot format indicators for one slot,and the remaining three slot format indicators may be information onslot formation indicators (slot format combination IDs 5, 6, and 7) forfour slots, and they may be successively applied to the four slots.

TABLE 4 Slot format combination ID Slot Formats 0  0 1  1 2  2 3 19 4  95 0 0 0 0 6 1 1 1 1 7 2 2 2 2

The terminal may receive configuration information of the PDCCH fordetecting the slot format indicator information through the highersignal, and it may detect the slot format indicators in accordance withthe configuration. For example, the terminal may be configured with atleast one of CORESET configuration for detecting the slot formatindicator information, search space configuration, RNTI information usedfor CRC scrambling of the DCI for transmitting the slot format indicatorinformation, a search space period, or offset information.

FIG. 9A illustrates a channel occupancy time in a wireless communicationsystem according to an embodiment of the disclosure.

FIG. 9A illustrates a case where PDCCH regions 920, 922, and 924 inwhich a terminal should detect slot format indicator information areprovided, and the period of the PDCCH region is of 2 slots. In otherwords, the terminal may detect DCI that is CRC-scrambled with slotformat indicator identifiers (e.g., SFI-RNTI or new RNTI) in the PDCCHregions 920, 922, and 924 (or CORESET) in slot n 900, slot n+2 902, andslot n+4 904 in accordance with the configured PDCCH region and theperiod thereof, and it may acquire the slot format indicator for twoslots through the detected DCI. In this case, the detected DCI mayinclude slot format indicator information for two or more slots, and forhow many slots the slot format indicators are included in the DCI may beconfigured through a higher signal. Configuration information regardingfor how many slots the slot format indicators are included in the DCImay be included in the higher signal that is equal to the higher signalfor configuring the slot format indicator information.

Referring to FIG. 9A, the terminal may acquire slot formation indicatorinformation 910 and 911 for slot n 900 and slot n+1 901 in the PDCCHregion 920 of slot n 900. Similarly, the terminal may acquire slotformation indicator information 912 and 913 for slot n+2 902 and slotn+3 903 in the PDCCH region 922 of slot n+2 902. In this case, the slotformation indicator information 910, 911, 912, 913, and 914 may have mayhave at least one value of the format of Table 3. In this case, it isalso possible to have a new format in addition to the format of Table 3.

If the base station transmits the slot format indicator information inan unlicensed band, and in particular, if the slot format indicatorinformation includes the slot format indicators for a plurality ofslots, the base station may be unable to determine the slot formatindicator information for at least one slot depending on whether toaccess the channel in the unlicensed band. When transmitting the slotformat indicator information 914 and 915 for slot n+4 904 and slot n+5905 on PDCCH 924, it is necessary for the base station to determine howto indicate the slot format indicator information of slot n+5 905. Forexample, the base station may indicate that the slot format indicatorfor the time except the channel occupancy time is flexible.

Hereinafter, a method for allocating an uplink resource will bedescribed. The uplink resource for transmitting a signal or data may beallocated successively or non-successively, and if a specific resourceallocation type is determined, information indicating the uplinkresource allocation is construed in accordance with the specificresource allocation type.

-   -   Uplink Resource Allocation Type 0

The uplink resource allocation type 0 scheme is a resource allocationscheme in the unit of resource block groups (RBGs) each of which iscomposed of P successive resource blocks (RBs). In this case, the size Pof the RBG may be configured as one of configuration 1 and configuration2 through a higher signal, for example, rbg-size value of pusch-Config,and P may be determined as in Table 5 based on the information and thesize of the enabled uplink bandwidth part. Table 5 is a tablerepresenting the size of the bandwidth part and the size of P inaccordance with the RBG configuration value. In this case, the size ofthe bandwidth part corresponds to the number of PRBs constituting thebandwidth part.

TABLE 5 Carrier Bandwidth Part Size Configuration 1 Configuration 2 1-36  2  4 37-72  4  8  73-144  8 16 145-275 16 16

The uplink bandwidth part N_(BWP) may be determined as the total numberof RBGs N_(RBG)=ceiling (N_(BWP) ^(size)+N_(BWP) ^(start) mod P)/P).Here, the size of the first RBG RBG₀ is P−N_(BWP) ^(start) mod P. If thesize of (N_(BWP) ^(start)+N_(BWP) ^(size)) mod P is larger than 0, thesize of the last RBG RBG_(last) becomes (N_(BWP) ^(start)+N_(BWP)^(size)) mod P, whereas if the size of (N_(BWP) ^(start)+N_(BWP)^(size)) mod P is not larger than 0, the size of the last RBG RBG_(last)becomes P. The size of the remaining RBGs except the first and last RBGsbecomes P. In this case, N_(BWP) ^(star) means a CRB in which the BWPstarts relatively to CRB₀, and it may be understood as a point where aspecific BWP starts in the CRB. N_(BWP) ^(size) means the number of RBsincluded in the BWP. In this case, the length (or the size or the numberof bits) of the frequency resource allocation information is equal toN_(RBG), and the terminal can be configured or scheduled with resourceson which uplink transmission is configured or scheduled for each RBG inthe unit of the RBG through a bitmap composed of N_(RBG) bits. Forexample, the terminal may determine that the RBG region configured as 1in the bitmap is a resource allocated for the uplink transmission, andit may determine that the RBG region configured as 0 is not the resourceallocated for the uplink transmission. In this case, the RBG bitmap isaligned and mapped sequentially (in an ascending order) on an axis onwhich the frequency is increased. Through this method, the successive ornon-successive RBGs may be allocated for the uplink transmission.

-   -   Uplink Resource Allocation Type 1

The uplink resource allocation type 1 scheme is a successive frequencyresource allocation scheme within the enabled uplink bandwidth part. Thefrequency resource allocation information of the uplink resourceallocation type 1 scheme may be indicated to the terminal through aresource indication value (RIV). The length (or size or the number ofbits) of the frequency resource allocation information is the same asceiling(log₂(N_(BWP)(N_(BWP)+1)/2). The RIV indicates a frequencyresource allocation start RB RB_(start) and successively allocated L RBsL_(RBs).

${{{if}\left( {L_{RBs} - 1} \right)} \leq {\left\lfloor \frac{N_{BWP}}{2} \right\rfloor{then}{RIV}}} = {{N_{BWP}\left( {L_{RBs} - 1} \right)} + {RB_{start}}}$Else, RIV = N_(BWP)(N_(BWP) − L_(RBs) + 1) + (N_(BWP) − 1 − RB_(start))where, L_(RBs) ≥ 1andshallnotexceedN_(BWP) − RB_(start)

Here, N_(BWP) is the size of the enabled uplink bandwidth part and it isexpressed by the number of PRBs. RB_(start) is the first PRB startingthe uplink resource allocation, and L_(RBs) is the length or the numberof successive PRBs. In this case, if one of the DCI (hereinafter, ULgrant) that configures or schedules the uplink transmission, forexample, DCI format 0_0, is transmitted in a common search space (CSS),the size N_(BWP,0) of an initial bandwidth part is used.

Further, in case of one DCI format of the UL grant, for example, DCIformat 0_0 that is transmitted from a UE-specific common search space(USS), the size or the number of bits of the frequency resourceallocation information of the UL grant is determined as the size of theinitial bandwidth part N_(initial,BWP), but in case of the DCI for theUL grant to schedule another enabled bandwidth part, the RIV values areRB_(start)=0, K, 2K, . . . , (N_(initial,BWP)−1)·K and L_(RBs)=K, 2K, .. . , N_(initial,BWP)·K, and they are configured as follows.

${{{if}\left( {L_{RBs}^{\prime} - 1} \right)} \leq {\left\lfloor \frac{N_{{initial},{BWP}}}{2} \right\rfloor{then}{RIV}}} = {{N_{{initi{al}},{BWP}}\left( {L_{RBs}^{\prime} - 1} \right)} + {RB}_{start}^{\prime}}$Else, RIV = N_(initial, BWP)(N_(initial, BWP) − L_(RBs)^(′) + 1) + (N_(initial, BWP) − 1 − RB_(start)^(′))${where},{L_{RBs}^{\prime} = \frac{L_{RBs}}{K}},{{RB}_{start}^{\prime} = \frac{{RB}_{start}}{K}},{{{and}{where}L_{RBs}^{\prime}{shall}{not}{exceed}N_{{initi{al}},{BWP}}} - {RB}_{start}^{\prime}}$

In this case, in case of N_(active,BWP)>N_(initial,BWP) in a state wherethe bandwidth of another enabled bandwidth part is N_(active,BWP), K isa natural number that satisfies

${K \leq \left\lfloor \frac{N_{{active},{BWP}}}{N_{{initial},{BWP}}} \right\rfloor},$and otherwise, K becomes K=1.

-   -   Uplink Resource Allocation Type 2

The uplink resource allocation type 2 scheme is an allocation scheme sothat uplink signal or channel transmission frequency resources aredistributed over the whole enabled uplink bandwidth part, and it is sofeatured that distances or intervals between the allocated frequencyresources are equal or equivalent to each other. According to the uplinkresource allocation type 2, the resource allocation is uniformlydistributed on the whole frequency band, and thus the uplink resourceallocation type 2 may be limitedly applied in case of transmittinguplink signals or channels that are transmitted in a carrier, cell, orbandwidth part operating in an unlicensed band in which frequencyallocation requirements, such as power spectral density (PSD)requirements or occupancy channel bandwidth (OCB) conditions, should besatisfied.

Referring to FIG. 9B, the uplink resource allocation type 2 scheme willbe described as follows.

FIG. 9B illustrates a case where the terminal is configured to performuplink signal transmission/reception with the base station through abandwidth part 950, and the terminal is scheduled with uplink datachannel transmission through the uplink resource allocation type 2, andit is assumed that the bandwidth part 950 is composed of 51 PRBsaccording to an embodiment of the disclosure. In accordance with theuplink resource allocation type 2, the 51 PRBs may constitute L (in caseof FIG. 9B, L=5) resource region sets, and each resource region set maybe composed of

$N = {{\left\lfloor \frac{N_{BWP}}{L} \right\rfloor{or}N} = {\left\lfloor \frac{N_{BWP}}{L} \right\rfloor + 1}}$PRBs. In case of FIG. 9B, the first resource region set 930 is composedof 11 PRBs (#i, #i+5, #i+10, #i+15, . . . , #i+45, #i+50), and theremaining resource region set, for example, the fourth resource regionset 940 is composed of 10 PRBs (#i+3, #i+8, #i+13, #i+18, . . . ,#i+48). In other words, the numbers of PRBs included in the resourceregion sets may differ in accordance with the size of the bandwidth partor the number of PRBs of the bandwidth part. The terminal may beallocated with one or more resource region sets configured as above, orit may be allocated with successive resource region sets (e.g., resourceregion set #0, #1 or #2, #3, and #4 through a method similar to theuplink resource allocation type 1 (e.g., allocation based on the RIVvalue), or it may be allocated with successive or non-successiveresource region sets similarly to the uplink resource allocation type 0(e.g., allocation based on a bitmap).

For example, in case that the terminal is allocated with the successiveresource allocation region sets, in a similar manner to the uplinkresource allocation type 1, the terminal may determine, if N resourceregion sets exist, allocated frequency resource regions (or allocatedresource region sets) through the resource indication value (RIV)expressing a start resource region set RB_(start) of the frequencyresource allocation and L successive resource region sets, and in thiscase, the RIV value is as follows.

${{{if}\left( {L - 1} \right)} \leq {\left\lfloor \frac{N}{2} \right\rfloor{then}{RIV}}} = {{N\left( {L - 1} \right)} + {RB_{start}}}$Else, RIV = N(N − L + 1) + (N − 1 − RB_(start))

For example, in case of RIV=0, this means the first resource region setor resource region set #0, and in this case, one resource region setcomposed of PRB #i, #i+10, #i+20, . . . , and #i+50 of FIG. 9B. In thiscase, the length (or size or the number of bits) of the frequencyresource allocation information may be ceiling(log₂(N(N+1)/2).

As another example, in case of being allocated with successive ornon-successive resource region sets using the bitmap, an L-bit bitmapindicating L resource region sets constituting the bandwidth part 950 inan ascending order of frequency resources or in an ascending order ofresource region set indexes may be configured, and the resource regionsets may be allocated through the bitmap. For example, in case of FIG.9B, the location of the resource region set may be indicated through thebitmap composed of 5 bits, and bitmap 10000 means that the firstresource region set, that is, one resource region set composed of PRB#i, #i+10, #i+20, . . . , and #i+50 of FIG. 9B, is allocated. Bitmap00010 means that the fourth resource region set, that is, PRB #i+3,#i+8, #i+13, #i+18, . . . , and #i+48 of FIG. 9B is allocated. IN thiscase, the length (or size or the number of bits) of the frequencyresource allocation information may be L.

-   -   Uplink Resource Allocation Type 3

FIG. 9C is a diagram illustrating uplink resource allocation type 3according to an embodiment of the disclosure.

Referring to FIG. 9C, the uplink resource allocation type 3 scheme is anallocation scheme so that uplink signal or channel transmissionfrequency resources are distributed over the whole enabled uplinkbandwidth part, and it is so featured that allocated resource groups (orallocated resource blocks or allocated resource clusters) (e.g., 951 or961) that are successive resources are entirely distributed within thebandwidth part through an iterative transmission scheme or the like(e.g., 951, 952, and 953, and 961, 962, and 963). That is, the allocatedresource group 951 that is the successive resource may iteratively existin the frequency resource, such as 951, 952, and 953, and accordingly, aplurality of allocated resource groups may exist in the bandwidth part.According to the uplink resource allocation type 3, the successiveallocated resource groups (or blocks or clusters) are distributed in thefrequency band, and thus the uplink resource allocation type 3 may belimitedly applied in case of transmitting uplink signals or channelsthat are transmitted in a carrier, cell, or bandwidth part operating inthe unlicensed band in which frequency allocation requirements, such aspower spectral density (PSD) requirements or occupancy channel bandwidth(OCB) conditions, should be satisfied.

In case of the base station and the terminal supporting the plurality offrequency resource allocation schemes (i.e., in case of the terminalpredefined or configured to use the plurality of frequency resourceallocation schemes), it is necessary to provide a method for correctlydetermining the frequency resource allocation scheme that should beapplied during transmission of uplink signals or channels. Accordingly,in the disclosure, a method by the terminal for determining thefrequency resource allocation scheme during transmission of the uplinksignals or channels of the terminal is proposed.

Hereinafter, in various embodiments of the disclosure, for conveniencein explanation, the uplink resource allocation scheme is divided intotwo schemes of a first scheme and a second scheme. Here, the firstscheme means a scheme in which uplink signal transmission resources aresuccessively allocated on a frequency axis like the uplink resourceallocation type 1 scheme. The second scheme means a resource allocationscheme of the type in which the uplink signal transmission resources areuniformly distributed in the bandwidth part at equal intervals on thefrequency axis like the uplink resource allocation type 2 scheme. Inthis case, expression of the uplink resource allocation type 1 as thefirst scheme and expression of the uplink resource allocation type 2scheme as the second scheme are merely exemplary, and it is alsopossible to express the resource allocation schemes modified based onthe types 1 and 2 as the first scheme and the second scheme. Forexample, the uplink resource allocation type 3 or 4 may be included inthe first scheme and the second scheme (preferably, the type 3 or type 4may be included in the second scheme). In this case, it may also bepossible to classify the resource allocation type 2 or 4 into a thirdscheme.

Further, if the uplink resource allocation scheme is configured to aspecific uplink resource allocation type, the base station may createuplink resource allocation information in accordance with the specificuplink resource allocation type, and the terminal may construe theuplink resource allocation information in accordance with the specifictype. Hereinafter, the technology to configure the specific uplinkresource allocation scheme may mean that the base station creates theuplink resource allocation information in accordance with the specificuplink resource allocation type (or in accordance with the resourceallocation scheme modified based on the specific uplink resourceallocation type) to transfer the created uplink resource allocationinformation as a higher signal or UL grant (DCI), and the terminalconstrues the uplink resource allocation information transferred to thehigher signal or UL grant (DCI) in accordance with the specific uplinkresource allocation type (or in accordance with the resource allocationscheme modified based on the specific uplink resource allocation type)to identify the allocated uplink resource.

First Embodiment

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes,and the terminal determines a random access preamble (hereinafter,preamble or physical random access channel (PRACH)) transmissionfrequency resource allocation scheme or a frequency resource region(hereinafter, frequency resource allocation scheme).

In this embodiment, the base station may receive, from the terminal,information on functions or capability supportable by the terminal andincluding the frequency resource allocation scheme of the preamble thatcan be supported by at least the terminal, and through this, the basestation may determine the frequency resource allocation scheme of thepreamble that can be supported by the terminal. Thereafter, the basestation may indicate or configure one or more preamble frequencyresource allocation schemes to the terminal so that the terminal thatsupports a plurality of frequency resource allocation schemes cantransmit the preamble in accordance with the frequency resourceallocation scheme that the base station supports or the base stationintends to receive from the terminal. Meanwhile, in an embodiment of thedisclosure, the higher signal or system information configuration methodfor indicating or configuring the preamble resource allocation scheme(e.g., enable/disenable, enumerate, and choice) is merely exemplary, andthe disclosure is not limited thereto.

Further, in the disclosure, a method for indicating or configuring thepreamble frequency resource allocation scheme to the terminal will bedescribed, but it may be also possible that the base station indicatesor configures the preamble frequency resource region to the terminal,and the terminal determines the preamble frequency resource allocationscheme in accordance with the frequency resource region. In this case,the preamble frequency resource allocation scheme applied to thespecific frequency resource region may be predetermined or it can beconfigured by the base station.

Method 1-1: Configuration of a Preamble Transmission Frequency ResourceAllocation Scheme Through System Information or Higher Signal

Hereinafter, the method 1-1 will be described in more detail. The method1-1 is a method in which the base station indicates or configures thepreamble transmission frequency resource allocation scheme to theterminal through the system information or higher signal. Because thepreamble transmission frequency resource allocation scheme is indicatedor configured through the system information, all the terminals cantransmit the preamble through the same frequency resource allocationscheme in the bandwidth part in which the preamble is transmitted. Inthis case, the preamble transmission frequency resource allocationscheme may be included in random access related configurationinformation (e.g., rach-configcommon or prach-ConfigurationIndex) to betransmitted to the terminal. In this case, a default preambletransmission frequency resource allocation scheme between the basestation and the terminal may be predefined. For example, the firstscheme may be the default preamble transmission frequency allocationscheme (e.g., scheme for transmitting the preamble through K successivePRBs), and a scheme except the first scheme, for example, the frequencyresource allocation scheme of the second scheme, may be enabled throughthe system information. If the frequency resource allocation scheme ofthe second scheme is enabled, the terminal determines the second schemeas the preamble transmission frequency resource allocation scheme. Inthis case, if the frequency resource allocation scheme of the secondscheme is enabled, it may be possible that the terminal determines boththe first scheme and the second scheme as the preamble transmissionfrequency resource allocation schemes, and in this case, thetransmission frequency resource allocation scheme that the terminalshould use during the preamble transmission may be determined through atleast one of method 1-2 and method 1-3 proposed in embodiment 1.

Meanwhile, the preamble-transmittable frequency resource region may bedetermined through a higher signal (e.g., the smallest PRB index of thepreamble-transmittable frequency resource region, the lowest frequency,or msg1-FrequencyStart), the number of preamble frequency multiplexingn_(RA)∈{0, 1, . . . , M−1} (here, M is a value configured as the highersignal (e.g., msg1-FDM)), and preamble-transmittable time domainresource information (e.g., prach-ConfigurationIndex).

As another example, the base station may designate and configures atleast one of uplink resource allocation schemes to the terminal throughthe system information. For example, the base station may designate thatthe terminal uses one of the first scheme, or the second scheme, or oneof the first and second schemes as the preamble resource allocationscheme. If both the first and second schemes are used for the preambletransmission frequency resource allocation, the terminal may determinethe transmission frequency resource allocation scheme that should beused during the preamble transmission through at least one of method 1-2and method 1-3 proposed in the embodiment 1.

Method 1-2: Determination of the Preamble Transmission FrequencyResource Allocation Scheme Depending on Whether the Preamble isTransmitted within a Channel Occupancy Time of the Base Station

Hereinafter, the method 1-2 will be described in more detail. The method1-2 is so featured that if the preamble transmission frequency resourceallocation schemes are configured through the method 1-1, the preambletransmission frequency resource allocation schemes may differ dependingon whether the preamble is transmitted within the channel occupancy timeof the base station. Through this, the preamble transmission frequencyresource allocation schemes may be identical to or different from eachother depending on whether the preamble is transmitted within thechannel occupancy time of the base station.

It is preferable that the base station controls the uplink signaltransmission of terminals within the channel occupancy time in which thebase station accesses and uses the channel after performing the channelaccess procedure. For example, the base station may transmit the DCIindicating the preamble transmission to at least one terminal on thedownlink control channel, and the terminal having received this maytransmit the preamble in accordance with the DCI. Further, the basestation may indicate to transmit an uplink control channel (PUCCH) and adata channel (PUSCH) to the terminal, and the uplink signals andchannels may be multiplexed. Accordingly, the base station is requiredto make the uplink signals and channels transmitted by the terminal inat least one slot or a transmission time interval be effectivelymultiplexed by making the uplink signals and channels have the sameresource allocation scheme in at least the channel occupancy time.Accordingly, in the disclosure, a method is provided, in which thepreamble transmission frequency resource allocation schemes areindependently configured depending on whether at least the preamble istransmitted within the channel occupancy time of the base station.

For example, the terminal may be configured with the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe preamble within the channel occupancy time of the base station andthe transmission resource allocation scheme (e.g., second scheme) incase of transmitting the preamble in a time except the channel occupancytime of the base station from the base station through the systeminformation or the higher signal. Further, the transmission resourceallocation scheme in case of transmitting the preamble in the timeexcept the channel occupancy time of the base station may be predefinedbetween the base station and the terminal (e.g., default resourceallocation scheme), and the transmission resource allocation scheme(e.g., first scheme) in case of transmitting the preamble within thechannel occupancy time of the base station may be configured or enabledby the base station through the system information or the higher signal.Similarly, the transmission resource allocation scheme in case oftransmitting the preamble within the channel occupancy time of the basestation may be predefined between the base station and the terminal(e.g., default resource allocation scheme), and the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe preamble in the time except the channel occupancy time of the basestation may be configured or enabled by the base station through thesystem information or the higher signal. Further, if the terminal is notconfigured with the transmission resource allocation scheme in case oftransmitting the preamble within the channel occupancy time of the basestation, or if the transmission resource allocation scheme is notenabled, the terminal may apply the transmission resource allocationscheme in case of transmitting the preamble in the time except thechannel occupancy time of the base station even to a case oftransmitting the preamble within the channel occupancy time of the basestation.

Similarly, the transmission resource allocation scheme in case oftransmitting the preamble within the channel occupancy time of the basestation may be predefined between the base station and the terminal(e.g., default resource allocation scheme), and the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe preamble in the time except the channel occupancy time of the basestation may be configured or enabled by the base station through thesystem information or the higher signal. In this case, if the terminalis not configured with the transmission resource allocation scheme incase of transmitting the preamble in the time except the channeloccupancy time of the base station, or if the scheme is not enabled, theterminal may apply the transmission resource allocation scheme in caseof transmitting the preamble within the channel occupancy time of thebase station even to a case of transmitting the preamble within thechannel occupancy time of the base station.

As described above, the terminal, having determined the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe preamble within the channel occupancy time of the base station andthe transmission resource allocation scheme (e.g., second scheme) incase of transmitting the preamble in the time except the channeloccupancy time of the base station, may determine whether the preambletransmission time or the transmission slot is a time (or slot) withinthe channel occupancy time of the base station or a time (or slot)except the channel occupancy time, and the terminal may transmit thepreamble through a correct transmission resource allocation scheme inaccordance with the result of the determination. In this case, theterminal may determine whether the base station occupies the channel orwhether the base station accesses the channel depending on whether todetect a reference signal (e.g., DMRS) transmitted by the base station,or the terminal may determine whether the base station occupies thechannel through reception of information on whether the base stationaccesses the channel or information on the channel occupancy time of thebase station that is transmitted by the base station through thedownlink control channel.

In this case, the information on whether the base station accesses thechannel or information on the channel occupancy time may be composed ofnot only information on the at least one bandwidth part and onetransmission interval or slot but also at least one of a plurality ofbandwidth parts or a plurality of slots. Further, the information onwhether the base station accesses the channel or information on thechannel occupancy time may be composed of information on one or moresubband units having a smaller size than the size of the bandwidth partor information on one or more mini-slots or transmission time intervalsor symbols composed of symbols that are smaller than symbols. Forexample, as shown in FIG. 9A, in case that the base station transmits asignal by accessing an unlicensed band channel after performing thechannel access procedure, the base station may transmit the channeloccupancy time, slot format indicator information 910, 911, 912, 913,and 914 within the channel occupancy time, or other information capableof determining this (e.g., channel occupancy start time and channeloccupancy end time) to the terminal through the PDCCH. The terminalhaving received this may determine whether the preamble is transmittedwithin the determined channel occupancy time of the base station, and itmay transmit the preamble according to the method 1-2 in accordance withthe result of the determination.

Method 1-3: Determination of the Frequency Resource Allocation SchemeThrough DCI Indicating the Preamble Transmission

Hereinafter, the method 1-3 will be described in more detail. The method1-3 is a method in which the preamble transmission frequency resourceallocation scheme is independently configured depending on whether thepreamble is transmitted through an indication of the base station or inaccordance with the determination of the terminal without any separatebase station indication in case that the transmission frequency resourceallocation scheme of the preamble is configured through the method 1-1or the like. Through this, the preamble transmission frequency resourceallocation schemes may be identical to or different from each other inaccordance with a case where the preamble is transmitted through theindication of the base station (or in case that the preamble istransmitted in a contention-free random access process) or a case wherethe preamble is transmitted in accordance with the determination of theterminal without any separate base station indication (or in case thatthe preamble is transmitted in a contention-based random accessprocess).

Here, the case where the preamble is transmitted through the indicationof the base station or the contention-free random access process means acase where the terminal, having received the DCI of which the CRC isscrambled with the RA-RNTI among the DCI being transmitted on thedownlink control channel, transmits the preamble in accordance with theDCI configuration or indication information. Meanwhile, the case wherethe preamble is transmitted in accordance with the determination of theterminal without the indication of the base station or thecontention-based random access process means a case where the terminaltransmits the preamble for the purpose of an uplink data transmissionresource request if the terminal transmits the preamble to initiallyaccess the cell or if the terminal is unable to be allocated with theresource for transmitting the uplink data from the base station.

Accordingly, in case that the preamble is transmitted in accordance withthe indication of the base station, the terminal, having received, forexample, the DCI of which the CRC is scrambled with the RA-RNTI amongthe DCI being transmitted on the downlink control channel, transmits thepreamble in accordance with the information indicated or configured bythe base station through the DCI. In the above case, the base stationcan indicate that one or more terminals transmit the uplink controlchannel (PUCCH) or the data channel (PUSCH) during the time or slot inwhich the preamble is transmitted, and thus the uplink signals andchannels can be multiplexed. Accordingly, it is necessary for the basestation to make the uplink signals and channels transmitted by theterminal in the transmission interval or slot in which the base stationindicates the preamble transmission be effectively multiplexed by makingthe uplink signals and channels transmitted by the terminals have thesame resource allocation scheme. Accordingly, in the disclosure, amethod is provided, in which the preamble transmission frequencyresource allocation schemes can be independently configured depending onwhether the preamble is transmitted in accordance with the indication ofthe base station.

For example, the terminal may be configured with the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe preamble in accordance with the indication of the base station andthe transmission resource allocation scheme (e.g., second scheme) incase of transmitting the preamble in accordance with the determinationof the terminal from the base station through the system information orthe higher signal. In this case, the transmission resource allocationscheme in case of transmitting the preamble in accordance with theindication of the base station may be predefined between the basestation and the terminal (e.g., default resource allocation scheme), andthe transmission resource allocation scheme (e.g., first scheme) in caseof transmitting the preamble in accordance with the determination of theterminal may be configured or enabled by the base station through thesystem information or the higher signal. In this case, if the terminalis not configured with the transmission resource allocation scheme incase of transmitting the preamble in accordance with the determinationof the terminal or the scheme is not enabled, the terminal may apply thetransmission resource allocation scheme in case of transmitting thepreamble in accordance with the indication of the base station even tothe case of transmitting the preamble in accordance with thedetermination of the terminal. Similarly, the transmission resourceallocation scheme in case of transmitting the preamble in accordancewith the determination of the terminal may be predefined between thebase station and the terminal (e.g., default resource allocationscheme), and the transmission resource allocation scheme (e.g., firstscheme) in case of transmitting the preamble in accordance with theindication of the base station may also be configured or enabled by thebase station through the system information or the higher signal.Further, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the preamble inaccordance with the indication of the base station or if the scheme isnot enabled, the terminal may also apply the transmission resourceallocation scheme in case of transmitting the preamble in accordancewith the determination of the terminal even to the above-described case.

In this case, if the preamble is transmitted in accordance with theindication of the base station, it is also possible to determine thetransmission resource allocation scheme of the preamble throughinformation in the DCI indicating the preamble transmission. Forexample, the transmission resource allocation scheme of the preamble maybe indicated or configured through at least one field in the DCI ofwhich the CRC is scrambled with the RA-RNTI, for example, a transmissionresource allocation scheme identifier. In this case, the transmissionresource allocation scheme identifier may be added as a new field, or atleast one bit among the preexisting fields may be used or configured asthe transmission resource allocation scheme identifier. For example, thetransmission resource allocation scheme of the preamble may be indicatedor configured through one MSB bit among the frequency-axis resourceallocation fields.

Meanwhile, because it is apparent not only to consider method 1-3together in the process of determining the transmission resourceallocation scheme of the preamble using method 1-2 but also to considermethod 1-2 together in the process of determining the transmissionresource allocation scheme of the preamble using method 1-3, thedetailed description thereof will be omitted.

Second Embodiment

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes.According to this method, the terminal transmits a random accesspreamble, and if a random access response (hereinafter, RAR or RAR ULgrant) is received from the base station as one of correspondingresponse signals, the terminal determines the transmission frequencyresource allocation scheme for an uplink data channel that is scheduledthrough the RAR.

The base station transmits the DCI of which the CRC is scrambled withthe RA-RNTI on a downlink control channel to the terminal in response tothe preamble transmitted by the terminal. The terminal having receivedthe DCI receives a PDSCH in accordance with information indicated orscheduled through the DCI. A RAR MAC PDU is transmitted from the basestation to the terminal through the PDSCH, and the terminal identifies arandom access preamble identity (RAPID) transmitted by the base stationto the terminal in the RAR MAC PDU. In this case, the RAPID is a valuecreated by the terminal in accordance with the pre-transmitted preamble,and thus the terminal may identify that the received RAPID is the RAPIDfor the terminal through comparison of the RAPID for the preambletransmitted by the terminal itself with the received RAPID. If it isidentified that the received RAPID is the RAPID for the terminal, theterminal transmits the uplink data channel to the base station inaccordance with the information indicated or scheduled through the ULgrant included in the RAR MAC PDU. Table 6 is a table representing a RARUL grant field and the size thereof.

TABLE 6 RAR UL grant field Number of bits Frequency hopping flag  1PUSCH frequency resource allocation 14 PUSCH time resource allocation  4MCS  4 TPC command for PUSCH  3 CSI request  1

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes.According to this method, the terminal transmits a random accesspreamble, and if a random access response (hereinafter, RAR or RAR ULgrant) is received from the base station as one of correspondingresponse signals, the terminal determines the transmission frequencyresource allocation scheme for an uplink data channel (or msg3) that isscheduled through the RAR.

Method 2-1: Usage of the Same Resource Allocation Scheme as the PreambleResource Allocation Scheme

The method 2-1 is a method in which the terminal determines thetransmission frequency resource allocation scheme for the uplink datachannel scheduled through the RAR as the same resource allocation schemeas the preamble resource allocation scheme indicated or determinedthrough one or more of various methods according to embodiment 1 of thedisclosure. The method 2-1 has the advantage that additional informationfor indicating or configuring the transmission frequency resourceallocation scheme for the uplink data channel scheduled through the RARis not necessary.

Method 2-2: Determination of a Resource Allocation Scheme in Accordancewith Waveform Configuration for an Uplink Data Channel Scheduled ThroughRAR

Hereinafter, the method 2-2 will be described in more detail. In a 5Gsystem such as NR, the terminal may use a plurality of uplinktransmission waveforms. For example, in case of an NR system, theterminal may support both a CP-OFDM based uplink signal waveform and aDFT-s-OFDM based uplink waveform, and one of the waveforms may beconfigured to be used from the base station, or both the two kinds ofwaveforms may be used. Further, different waveforms may be predefined tobe used in accordance with transmission signals or channels or they maybe configured through a higher signal. For example, the terminal maydetermine the waveform for the uplink data channel through aninformation element (IE) of the system information (e.g.,msg3-transformPrecoder of RACH-ConfigCommon). For example, if themsg3-transformPrecoder is enabled, the terminal may determine that thewaveform for the uplink data channel is DFT-s-OFDM based waveform, andthe terminal may transmit the uplink data channel using the determinedwaveform. In this case, if the msg3-transformPrecoder is disabled or thefield is absent, the terminal may determine that the waveform of theuplink data channel is the CP-OFDM based waveform, and it may transmitthe uplink data channel using the determined waveform.

In general, the DFT-s-OFDM waveform has the characteristics that it hasa low peak-to-average power ratio (PAPR) as compared with the CP-OFDMwaveform, and it is more suitable in case of using successive resourceallocation on the frequency axis, whereas in case of the CP-OFDMwaveform, it can be used for non-successive resource allocation.Accordingly, it is possible to determine the resource allocation schemefor the uplink data channel in accordance with the waveformconfiguration for the uplink data channel scheduled through the RAR. Forexample, if the waveform for the uplink data channel scheduled throughthe RAR is configured as the DFT-s-OFDM waveform, the terminal maydetermine that the resource allocation for the uplink data channelscheduled through the RAR corresponds to the first scheme (successiveresource allocation scheme). If the waveform for the uplink data channelscheduled through the RAR is configured as the CP-OFDM waveform, theterminal may determine that the resource allocation for the uplink datachannel scheduled through the RAR corresponds to the second scheme(distributed resource allocation scheme).

Method 2-3: Indication of a Resource Allocation Scheme Through RAR ULGrant

The method 2-3 is a method for determining the resource allocationscheme for the uplink data channel scheduled through the RAR using atleast one field value among fields included in the RAR UL grant.

For example, fields indicating the resource allocation scheme for theuplink data channel are introduced in the RAR UL grant, and the terminalmay determine the resource allocation scheme for the uplink data channelscheduled through the RAR in accordance with the field value. Forexample, a resource allocation type indicator having a size of one bitis added, and if the field value is 0, it may be indicated that theresource allocation scheme for the uplink data channel scheduled throughthe RAR is the first scheme, whereas if the field value is 1, it may beindicated that the resource allocation scheme for the uplink datachannel scheduled through the RAR is the second scheme. In this case,the resource allocation scheme indicated by the name and the size of thefield and the bit value is merely exemplary. In this case, in case ofthe terminal performing at least contention-free based random access, aCSI request field of the RAR UL grant is not used, but is reserved, andthus it is possible to indicate the resource allocation scheme for theuplink data channel scheduled through the RAR using the field.

As another example, the resource allocation scheme for the uplink datachannel scheduled through a frequency hopping flag field of the RAR ULgrant may be determined. For example, if the uplink data channelscheduled through the RAR is transmitted in an unlicensed band cell, theflag field may be re-construed as information indicating the resourceallocation scheme for the uplink data channel scheduled through the RAR,or the resource allocation scheme for the uplink data channel may bedetermined in accordance with the field value through replacement of theflag field by the resource allocation type indicator.

As still another example, in accordance with the configuration value ofthe frequency hopping flag field of the RAR UL grant, the resourceallocation scheme for the uplink data channel may be determined. In caseof the second scheme, the frequency resource is uniformly distributedover the whole bandwidth part, and thus the frequency hopping for theuplink data channel allocated by the second scheme is not necessary.Accordingly, if the frequency hopping is configured (e.g., if the flagfield value is 1), the terminal may determine that the resourceallocation for the uplink data channel scheduled through the RARcorresponds to the first scheme, and if the frequency hopping is notconfigured (e.g., if the flag field value is 0), the terminal maydetermine that the resource allocation for the uplink data channelscheduled through the RAR corresponds to the second scheme.

Method 2-4: Determination of the Transmission Frequency ResourceAllocation Scheme Depending on Whether the Uplink Data Channel ScheduledThrough the RAR is Transmitted within the Channel Occupancy Time of theBase Station

Hereinafter, the method 2-4 will be described in more detail. The method2-4 is a method for determining the transmission frequency resourceallocation scheme of the uplink data channel depending on whether theuplink data channel is transmitted within the channel occupancy time ofthe base station if the transmission frequency resource allocationscheme of the uplink data channel (hereinafter, uplink data channel ormsg3) scheduled through the RAR is indicated or configured through atleast one of method 2-1, method 2-2, or method 2-3. Through this, thetransmission frequency resource allocation schemes of the uplink datachannel may be identical to or different from each other depending onwhether the uplink data channel is transmitted within the channeloccupancy time of the base station or in the time except the channeloccupancy time of the base station, and as a result, the transmissionfrequency resource allocation scheme of the uplink data channel(hereinafter, uplink data channel or smg3) may be identical to ordifferent from the transmission frequency resource allocation scheme ofthe uplink data channel indicated or configured through at least one ofthe method 2-1, method 2-2, or method 2-3.

It is preferable that the base station controls the uplink signaltransmission of terminals within the channel occupancy time in which thebase station accesses and uses the channel after performing the channelaccess procedure. For example, the base station may transmit the DCIindicating the preamble transmission to at least one terminal on thedownlink control channel, and the terminal having received this maytransmit the preamble in accordance with the DCI. Further, the basestation may indicate to transmit the uplink control channel (PUCCH) orthe data channel (PUSCH) to the terminal, and the uplink signals andchannels may be multiplexed. Accordingly, the base station is requiredto make the uplink signals and channels transmitted by the terminals inat least one slot or a transmission time interval be effectivelymultiplexed by making the uplink signals and channels have the sameresource allocation scheme in at least the channel occupancy time.Accordingly, a method is necessary, in which the transmission frequencyresource allocation schemes are independently configured depending onwhether at least the uplink data channel is transmitted within thechannel occupancy time of the base station.

For example, the terminal may transmit the uplink data channel using thetransmission resource allocation scheme (e.g., first scheme) in case oftransmitting the uplink data channel configured as RAR UL grant withinthe channel occupancy time of the base station and the transmissionresource allocation scheme (e.g., second scheme) in case of transmittingthe uplink data channel in the time except the channel occupancy time ofthe base station. In this case, the transmission resource allocationscheme in case of transmitting the uplink data channel in the timeexcept the channel occupancy time of the base station may be predefinedbetween the base station and the terminal (e.g., default resourceallocation scheme), and the transmission resource allocation scheme(e.g., first scheme) in case of transmitting the uplink data channelwithin the channel occupancy time of the base station may be configuredor enabled by the base station through the system information or thehigher signal or the RAR UL grant. Similarly, the transmission resourceallocation scheme in case of transmitting the uplink data channel withinthe channel occupancy time of the base station may be predefined betweenthe base station and the terminal (e.g., default resource allocationscheme), and the transmission resource allocation scheme (e.g., firstscheme) in case of transmitting the uplink data channel in the timeexcept the channel occupancy time of the base station may be configuredor enabled by the base station through the system information or thehigher signal or the RAR UL grant. Further, the transmission resourceallocation scheme in case of transmitting the uplink data channel in thetime except the channel occupancy time of the base station may beconfigured through the RAR UL grant (e.g., second scheme), and thetransmission resource allocation scheme (e.g., first scheme) in case oftransmitting the uplink data channel within the channel occupancy timeof the base station may be configured or enabled by the base stationthrough the system information or the higher signal. Similarly, thetransmission resource allocation scheme in case of transmitting theuplink data channel within the channel occupancy time of the basestation may be configured through the RAR UL grant (e.g., first scheme),and the transmission resource allocation scheme (e.g., second scheme) incase of transmitting the uplink data channel in the time except thechannel occupancy time of the base station may be configured or enabledby the base station through the system information or the higher signal.

Further, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the uplink datachannel within the channel occupancy time of the base station, or if thetransmission resource allocation scheme is not enabled, the terminal mayapply the transmission resource allocation scheme in case oftransmitting the uplink data channel in the time except the channeloccupancy time of the base station even to a case of transmitting theuplink data channel within the channel occupancy time of the basestation. Similarly, the transmission resource allocation scheme in caseof transmitting the uplink data channel within the channel occupancytime of the base station may be predefined between the base station andthe terminal (e.g., default resource allocation scheme), and thetransmission resource allocation scheme (e.g., first scheme) in case oftransmitting the uplink data channel in the time except the channeloccupancy time of the base station may be configured or enabled by thebase station through the system information or the higher signal. Inthis case, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the uplink datachannel in the time except the channel occupancy time of the basestation, or if the scheme is not enabled, the terminal may apply thetransmission resource allocation scheme in case of transmitting theuplink data channel in the channel occupancy time of the base stationeven to a case of transmitting the uplink data channel in the timeexcept the channel occupancy time of the base station.

As described above, the terminal may determine the transmission resourceallocation scheme (e.g., first scheme) in case of transmitting theuplink data channel within the channel occupancy time of the basestation and the transmission resource allocation scheme (e.g., secondscheme) in case of transmitting the uplink data channel in the timeexcept the channel occupancy time of the base station, and the terminalmay determine whether the uplink data channel transmission time or thetransmission slot is a time within the channel occupancy time of thebase station or a time except the channel occupancy time, and theterminal may transmit the uplink data channel through a correcttransmission resource allocation scheme in accordance with the result ofthe determination. In this case, the terminal may determine whether thebase station occupies the channel or whether the base station accessesthe channel depending on whether to detect a reference signal (e.g.,DMRS) transmitted by the base station, or the terminal may determinewhether the base station occupies the channel through reception ofinformation on whether the base station accesses the channel orinformation on the channel occupancy time of the base station that aretransmitted by the base station through the downlink control channel.

In this case, the information on whether the base station accesses thechannel or information on the channel occupancy time may be composed ofnot only information on at least one bandwidth part and one transmissioninterval or slot but also at least one of a plurality of bandwidth partsor a plurality of slots. Further, the information on whether the basestation accesses the channel or information on the channel occupancytime may be composed of information on one or more subband units havinga smaller size than the size of the bandwidth part or information on oneor more mini-slots or transmission time intervals or symbols composed ofsymbols that are smaller than the symbols. Such information may refer toFIG. 9A.

Third Embodiment

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes.According to this method, the terminal receives DCI (hereinafter ULgrant) for scheduling uplink data channel transmission from the basestation, and in case of transmitting the uplink data channelaccordingly, the terminal determines a transmission frequency resourceallocation scheme for an uplink data channel.

Method 3-1: Configuration of a Transmission Frequency ResourceAllocation Scheme of an Uplink Data Channel Through System Informationor a Higher Signal

The method 3-1 is a method in which the transmission frequency resourceallocation scheme of the uplink data channel is indicated or configuredto the terminal. By indicating or configuring the transmission frequencyresource allocation scheme of the uplink data channel through systeminformation, all terminals may transmit the uplink data channel in thesame frequency resource allocation scheme in a bandwidth part in whichthe uplink data channel is transmitted. In this case, the transmissionfrequency resource allocation scheme of the uplink data channel may beincluded in uplink data channel related configuration information (e.g.,pusch-config) to be transmitted to the terminal. In this case, a defaultfrequency allocation scheme between the base station and the terminalmay be predefined. For example, the first scheme may be the transmissionfrequency resource allocation scheme of the default uplink data channel,and the base station may enable the frequency resource allocation schemeof a scheme except the first scheme, for example, the frequency resourceallocation scheme of the second scheme, through the system informationor the higher signal. If the frequency resource allocation scheme of thescheme except the first scheme, for example, the second scheme, is notenabled through the system information or the higher signal, in otherwords, if the frequency resource allocation scheme of the second schemeis disabled, the terminal may determine that the transmission frequencyresource allocation scheme of the uplink data channel is the defaultfrequency resource allocation scheme.

If the frequency resource allocation scheme of the second scheme isenabled, the terminal determines the second scheme as the transmissionfrequency resource allocation scheme of the uplink data channel. In thiscase, if the frequency resource allocation scheme of the second schemeis enabled, the terminal may also determine that the both the firstscheme and the second scheme are the transmission frequency resourceallocation scheme of the uplink data channel, and in this case, thetransmission frequency resource allocation scheme that the terminalshould use during transmission of the uplink data channel may beindicated through the DCI for scheduling the uplink data channel or theUL grant, or it may be determined through at least one of other methodsproposed in embodiment 3.

The above-described method may be applicable to not only the uplink datachannel scheduled through the UL grant but also the uplink data channeltransmission frequency resource allocation scheme for the uplink datachannel scheduled without the UL grant. In an NR system, the uplink datachannel scheduled without the UL grant as described above may be calledthe uplink data channel configured through the configured ULtransmission or configured grant (or configured scheduling), and thetransmission frequency resource allocation scheme of the uplink datachannel scheduled without the UL grant may be configured separately fromthe transmission frequency resource allocation scheme of the uplink datachannel scheduled through the UL grant.

Method 3-2: Determination of a Resource Allocation Scheme in Accordancewith Waveform Configuration for an Uplink Data Channel

Hereinafter, the method 3-2 will be described in more detail. In a 5Gsystem such as NR, the terminal may use a plurality of uplinktransmission waveforms. For example, in case of an NR system, theterminal may support both a CP-OFDM based uplink signal waveform and aDFT-s-OFDM based uplink waveform, and one of the waveforms may beconfigured to be used from the base station, or both the two kinds ofwaveforms may be used. Further, different waveforms may be predefined tobe used in accordance with transmission signals or channels.

For example, the terminal may determine the waveform for the uplink datachannel through an information element (IE) of the system information(e.g., msg3-transformPrecoder of RACH-ConfigCommon). For example, if themsg3-transformPrecoder is enabled, the terminal may determine that thewaveform for the uplink data channel is the DFT-s-OFDM based waveform,and the terminal may transmit the uplink data channel scheduled throughthe RAR UL grant. In this case, if the msg3-transformPrecoder isdisabled or the field is absent, the terminal may determine that thewaveform for the uplink data channel is the CP-OFDM based waveform, andit may transmit the uplink data channel using the determined waveform.Similarly, the terminal may be additionally configured with the waveformfor the uplink data channel except the uplink data channel scheduledthrough the RAR UL grant, in other words, the waveform for the uplinkdata channel transmitted through the DCI or UL grant scrambled withC-RNTI or CS-RNTI, through the higher signal (e.g., transformPrecoder inpusch-Config and/or transformPrecoder in configuredGrantConfig).

In general, the DFT-s-OFDM waveform has the characteristics that it hasa low peak-to-average power ratio (PAPR) as compared with the CP-OFDMwaveform, and it is more suitable in case of using successive resourceallocation on the frequency axis, whereas in case of the CP-OFDMwaveform, it can be used for non-successive resource allocation.Accordingly, it is possible to determine the resource allocation schemefor the uplink data channel in accordance with the waveformconfiguration for the uplink data channel scheduled through the ULgrant. For example, if the waveform for the uplink data channelscheduled through the UL grant is configured as the DFT-s-OFDM waveform,the terminal may determine that the resource allocation for the uplinkdata channel scheduled through the UL grant corresponds to the firstscheme. If the waveform for the uplink data channel scheduled throughthe UL grant is configured as the CP-OFDM waveform, the terminal maydetermine that the resource allocation for the uplink data channelscheduled through the UL grant corresponds to the second scheme.

Further, it is also possible to determine the resource allocation schemefor the uplink data channel in accordance with the UL grant format(i.e., DCI format) scheduling the uplink data channel. For example, theresource allocation scheme for the uplink data channel scheduled throughone of UL grant formats for scheduling the uplink data channel (e.g., ULgrant for scheduling a fallback or default uplink data channel, as anexample, DCI format 0_0) and the resource allocation scheme for theuplink data channel scheduled through another one of the UL grantformats for scheduling the uplink data channel (e.g., UL grant forscheduling a general uplink data channel, as an example, DCI format 0_1)may be identical to or different from each other.

That is, the NR system will be described as an example. The terminal maydetermine that the uplink data channel scheduled to format 0_0 that isone of UL grant formats for scheduling the uplink data channel followsthe first scheme, and the uplink data channel scheduled to format 0-1that is one of UL grant formats for scheduling the uplink data channelfollows the second scheme. In this case, the DCI formats 0-0 and 0_1 aremerely exemplary, and the method may be able to be applied even toanother DCI format.

Method 3-3: Indication of a Resource Allocation Scheme Through RAR ULGrant

The method 3-3 is a method for determining the resource allocationscheme for the uplink data channel scheduled through the UL grant usingat least one field value among fields included in the UL grant (i.e.,DCI).

For example, fields indicating the resource allocation scheme for theuplink data channel are introduced in the UL grant, and the terminal maydetermine the resource allocation scheme for the uplink data channelscheduled in accordance with the field value. For example, a resourceallocation type indicator having a size of one bit may be separatelyadded to the UL grant, or the indicator having the size of one bit maybe added to the field indicating the frequency-axis resource allocationinformation, and if the field value is 0, it may be indicated that theresource allocation scheme for the uplink data channel scheduled throughthe UL grant is the first scheme, whereas if the field value is 1, itmay be indicated that the resource allocation scheme for the uplink datachannel scheduled through the UL grant is the second scheme. In thiscase, the resource allocation scheme indicated by the name and the sizeof the field and the bit value is merely exemplary. Further, it may alsobe possible to add the indicator having the size of one bit or a row tothe field indicating the time-axis resource allocation information or atable corresponding to this, and accordingly to indicate the resourceallocation scheme for the uplink data channel.

As another example, the terminal may determine the resource allocationscheme for the uplink data channel scheduled through a frequency hoppingflag field of the UL grant. For example, if the uplink data channelscheduled through the UL grant is transmitted in an unlicensed bandcell, the flag field may be re-construed as the resource allocationscheme for the uplink data channel scheduled through the UL grant, orthe resource allocation scheme for the uplink data channel may bedetermined in accordance with the field value through replacement of theflag field by the resource allocation type indicator.

Further, in accordance with the configuration value of the frequencyhopping flag field of the UL grant, the terminal may determine theresource allocation scheme for the uplink data channel. In case of thesecond scheme, the frequency resource is uniformly distributed over thewhole bandwidth part. Accordingly, the frequency hopping for the uplinkdata channel allocated through the second scheme is not necessary.Accordingly, if the frequency hopping is configured (e.g., if the flagfield value is 1), the terminal may determine that the resourceallocation for the uplink data channel scheduled through the UL grantcorresponds to the first scheme, and if the frequency hopping is notconfigured (e.g., if the flag field value is 0), the terminal maydetermine that the resource allocation for the uplink data channelscheduled through the UL grant corresponds to the second scheme.

Method 3-4: Determination of the Transmission Frequency ResourceAllocation Scheme Depending on Whether the Uplink Data Channel ScheduledThrough the UL Grant is Transmitted within the Channel Occupancy Time ofthe Base Station

Hereinafter, the method 3-4 will be described in more detail. The method3-4 is a method for determining the transmission frequency resourceallocation scheme of the uplink data channel depending on whether theuplink data channel is transmitted within the channel occupancy time ofthe base station if the transmission frequency resource allocationscheme of the uplink data channel (hereinafter, uplink data channel)scheduled through the UL grant is indicated or configured through atleast one of method 3-1, method 3-2, or method 3-3. Through the method,the transmission frequency resource allocation schemes of the uplinkdata channel may be identical to or different from each other dependingon whether the uplink data channel is transmitted within the channeloccupancy time of the base station or in the time except the channeloccupancy time of the base station, and as a result, the transmissionfrequency resource allocation scheme of the uplink data channel may beidentical to or different from the transmission frequency resourceallocation scheme of the uplink data channel indicated or configuredthrough at least one of the method 3-1, method 3-2, or method 3-3.

It is preferable that the base station controls the uplink signaltransmission of terminals within the channel occupancy time in which thebase station accesses and uses the channel after performing the channelaccess procedure. For example, the base station may transmit the ULgrant to one or more terminals on the downlink control channel, and theterminal having received this may transmit the uplink data channel inaccordance with the UL grant. Further, the base station may indicate totransmit the uplink control channel (PUCCH) or the data channel (PUSCH)to one or more terminals, and the uplink signals and channels may bemultiplexed. Accordingly, the base station is required to make theuplink signals and channels transmitted by the terminals in at least oneslot or a transmission time interval be effectively multiplexed bymaking the uplink signals and channels have the same resource allocationscheme in at least the channel occupancy time. Accordingly, a method isnecessary, in which the transmission frequency resource allocationschemes are independently configured depending on whether at least theuplink data channel is transmitted within the channel occupancy time ofthe base station.

For example, the terminal may transmit the uplink data channel using thetransmission resource allocation scheme (e.g., first scheme) in case oftransmitting the uplink data channel configured through the UL grantwithin the channel occupancy time of the base station and thetransmission resource allocation scheme (e.g., second scheme) in case oftransmitting the uplink data channel in the time except the channeloccupancy time of the base station. In this case, the transmissionresource allocation scheme in case of transmitting the uplink datachannel in the time except the channel occupancy time of the basestation may be predefined between the base station and the terminal(e.g., default resource allocation scheme), and the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe uplink data channel within the channel occupancy time of the basestation may be configured or enabled by the base station through thesystem information or the higher signal or the UL grant. Similarly, thetransmission resource allocation scheme in case of transmitting theuplink data channel within the channel occupancy time of the basestation may be predefined between the base station and the terminal(e.g., default resource allocation scheme), and the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe uplink data channel in the time except the channel occupancy time ofthe base station may be configured or enabled by the base stationthrough the system information or the higher signal or the UL grant. Inthis case, the transmission resource allocation scheme in case oftransmitting the uplink data channel in the time except the channeloccupancy time of the base station may be configured through the ULgrant (e.g., second scheme), and the transmission resource allocationscheme (e.g., first scheme) in case of transmitting the uplink datachannel within the channel occupancy time of the base station may beconfigured or enabled by the base station through the system informationor the higher signal. Similarly, the transmission resource allocationscheme in case of transmitting the uplink data channel within thechannel occupancy time of the base station may be configured through theUL grant (e.g., first scheme), and the transmission resource allocationscheme (e.g., second scheme) in case of transmitting the uplink datachannel in the time except the channel occupancy time of the basestation may be configured or enabled by the base station through thesystem information or the higher signal.

Further, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the uplink datachannel within the channel occupancy time of the base station, or if thetransmission resource allocation scheme is not enabled, the terminal mayapply the transmission resource allocation scheme in case oftransmitting the uplink data channel in the time except the channeloccupancy time of the base station even to a case of transmitting theuplink data channel within the channel occupancy time of the basestation. Similarly, the transmission resource allocation scheme in caseof transmitting the uplink data channel within the channel occupancytime of the base station may be predefined between the base station andthe terminal (e.g., default resource allocation scheme), and thetransmission resource allocation scheme (e.g., first scheme) in case oftransmitting the uplink data channel in the time except the channeloccupancy time of the base station may be configured or enabled by thebase station through the system information or the higher signal. Inthis case, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the uplink datachannel in the time except the channel occupancy time of the basestation, or if the scheme is not enabled, the terminal may apply thetransmission resource allocation scheme in case of transmitting theuplink data channel within the channel occupancy time of the basestation even to a case of transmitting the uplink data channel in thetime except the channel occupancy time of the base station.

As described above, the terminal may determine the transmission resourceallocation scheme (e.g., first scheme) in case of transmitting theuplink data channel within the channel occupancy time of the basestation and the transmission resource allocation scheme (e.g., secondscheme) in case of transmitting the uplink data channel in the timeexcept the channel occupancy time of the base station, and the terminalmay determine whether the uplink data channel transmission time or thetransmission slot is a time within the channel occupancy time of thebase station or a time except the channel occupancy time, and theterminal may transmit the uplink data channel through a correcttransmission resource allocation scheme in accordance with the result ofthe determination. In this case, the terminal may determine whether thebase station occupies the channel or whether the base station accessesthe channel depending on whether to detect a reference signal (e.g.,DMRS) transmitted by the base station, or the terminal may determinewhether the base station occupies the channel through reception ofinformation on whether the base station accesses the channel orinformation on the channel occupancy time of the base station that aretransmitted by the base station through the downlink control channel.

In this case, the information on whether the base station accesses thechannel or information on the channel occupancy time may be composed ofnot only information on at least one bandwidth part and one transmissioninterval or slot but also at least one of a plurality of bandwidth partsor a plurality of slots. Further, the information on whether the basestation accesses the channel or information on the channel occupancytime may be composed of information on one or more subband units havinga smaller size than the size of the bandwidth part or information on oneor more mini-slots or transmission time intervals or symbols composed ofsymbols that are smaller than the slots. Such information on whether thebase station accesses the channel or information on the channeloccupancy time may refer to FIG. 9A.

Method 3-5: Usage of the Same Resource Allocation Scheme as that of anUplink Data Channel Transmitted Through RAR UL Grant

The method 3-5 is a method in which the terminal applies the same schemeas the transmission frequency resource allocation scheme for the uplinkdata channel scheduled through the RAR UL grant indicated or determinedthrough one or more of various methods according to embodiment 2 of thedisclosure. The method 3-5 has the advantage that additional informationfor indicating or configuring the transmission frequency resourceallocation scheme for the uplink data channel scheduled through the ULgrant is not necessary, and the terminal may transmit all the uplinkdata channel using the same transmission frequency resource allocationscheme without discriminating the transmission frequency resourceallocation scheme for the uplink data channel according to the DCI forscheduling the uplink data channel.

Fourth Embodiment

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes.According to this method, the terminal receives DCI for schedulingdownlink data channel (PDSCH) from the base station, and in case oftransmitting the reception result of the received PDSCH or responsesignal (HARQ-ACK) information on an uplink control channel (PUCCH), theterminal determines a transmission frequency resource allocation schemefor an uplink control channel. In embodiment 4, a case where theterminal transmit the reception result of the received PDSCH or responsesignal (HARQ-ACK) information on the uplink control channel (PUCCH) willbe described as an example, but this embodiment will be able to beapplied even to a case where channel state information is transmittedthrough the uplink control channel (PUCCH).

Method 4-1: Configuration of a Transmission Frequency ResourceAllocation Scheme of an Uplink Control Channel Through SystemInformation or a Higher Signal

Hereinafter, the method 4-1 will be described in more detail. The method4-1 is a method in which the base station indicates or configures thetransmission frequency resource allocation scheme of the uplink controlchannel through system information or a higher signal. By indicating orconfiguring the transmission frequency resource allocation scheme of theuplink control channel through the system information, all terminals maytransmit the uplink control channel in the same frequency resourceallocation scheme in a bandwidth part in which the uplink controlchannel is transmitted. In this case, the transmission frequencyresource allocation scheme of the uplink control channel may be includedin uplink control channel related configuration information (e.g.,pucch-config) to be transmitted to the terminal. In this case, a defaultfrequency allocation scheme between the base station and the terminalmay be predefined. For example, the first scheme may be the transmissionfrequency resource allocation scheme of the default uplink controlchannel, and the frequency resource allocation scheme of a scheme exceptthe first scheme, for example, the frequency resource allocation schemeof the second scheme, may be enabled through the system information orthe higher signal. If the frequency resource allocation scheme of thescheme except the first scheme, for example, the second scheme, is notenabled through the system information or the higher signal, in otherwords, if the frequency resource allocation scheme of the second schemeis disabled, the terminal may determine that the transmission frequencyresource allocation scheme of the uplink control channel is the defaultfrequency resource allocation scheme.

If the frequency resource allocation scheme of the second scheme isenabled, the terminal determines the second scheme as the transmissionfrequency resource allocation scheme of the uplink control channel. Inthis case, if the frequency resource allocation scheme of the secondscheme is enabled, the terminal may also determine that the both thefirst scheme and the second scheme are the transmission frequencyresource allocation scheme of the uplink control channel, and in thiscase, the transmission frequency resource allocation scheme that shouldbe used by the terminal during transmission of the uplink controlchannel may be indicated through the DCI (in other words, DCI forscheduling the PDSCH) for indicating or scheduling the uplink controlchannel, or it may be determined through at least one of other methodsproposed in embodiment 4. Here, the DCI for indicating or scheduling theuplink control channel may be DCI for scheduling the PDSCH, and if theterminal receives the DCI for scheduling reception of a downlink datachannel (PDSCH) from the base station and it transmits the receptionresult of the received PDSCH or response signal (HARQ-ACK) informationon the uplink control channel (PUCCH), the terminal indicatesconfiguration information, such as uplink control channel resource andtime, on which the terminal is to transmit the response signal throughthe DCI.

Further, the transmission frequency resource allocation scheme of theuplink control channel may be configured to resources of the uplinkcontrol channel configured through the system information or the highersignal. That is, the base station can configure the frequency resourceallocation schemes of the uplink control channel so that the frequencyresource allocation schemes of the uplink control channel are identicalto or different from each other on uplink control channel resource #0and uplink control channel resource #1.

Method 4-2: Determination of a Resource Allocation Scheme in Accordancewith Waveform Configuration for an Uplink Data Channel

Hereinafter, the method 4-2 will be described in more detail. In a 5Gsystem such as NR, the terminal may use a plurality of uplinktransmission waveforms. For example, in case of an NR system, theterminal may support both a CP-OFDM based uplink signal waveform and aDFT-s-OFDM based uplink waveform, and one of the waveforms may beconfigured to be used from the base station, or both the two kinds ofwaveforms may be used. Further, different waveforms may be predefined tobe used in accordance with transmission signals or channels or they maybe configured through the higher signal.

For example, the terminal may determine the waveform for the uplink datachannel through an information element (IE) of the system information(e.g., msg3-transformPrecoder of RACH-ConfigCommon). For example, if themsg3-transformPrecoder is enabled, the terminal may determine that thewaveform for the uplink data channel is the DFT-s-OFDM based waveform,and the terminal may transmit the uplink data channel, for example, theuplink data channel scheduled through RAR UL grant, using the determinedwaveform. In this case, if the msg3-transformPrecoder is disabled or thefield is absent, the terminal may determine that the waveform for theuplink data channel is the CP-OFDM based waveform, and it may transmitthe uplink data channel using the determined waveform. Similarly, theterminal may be additionally configured with the waveform for the uplinkdata channel except the uplink data channel scheduled through the RAR ULgrant, in other words, the waveform for the uplink data channeltransmitted through the DCI or UL grant scrambled with the C-RNTI orCS-RNTI, through the higher signal (e.g., transformPrecoder inpusch-Config and/or transformPrecoder in configuredGrantConfig).

In general, the DFT-s-OFDM waveform has the characteristics that it hasa low peak-to-average power ratio (PAPR) as compared with the CP-OFDMwaveform, and it is more suitable in case of using successive resourceallocation on the frequency axis, whereas in case of the CP-OFDMwaveform, it can be used for non-successive resource allocation.Accordingly, it is possible to determine the resource allocation schemefor the uplink control channel in accordance with the waveformconfiguration for the uplink data channel scheduled through the ULgrant. For example, if the waveform for the uplink data channelscheduled through the UL grant is configured as the DFT-s-OFDM waveform,the terminal may determine that the resource allocation for the uplinkcontrol channel scheduled through the UL grant corresponds to the firstscheme. If the waveform for the uplink data channel scheduled throughthe UL grant is configured as the CP-OFDM waveform, the terminal maydetermine that the resource allocation for the uplink control channelcorresponds to the second scheme.

In this case, it is also possible to determine the resource allocationscheme for the uplink control channel in accordance with the DCI formatfor scheduling the downlink data channel. For example, the resourceallocation scheme for the downlink data channel scheduled through one ofDCI formats for scheduling the downlink data channel (e.g., DCI forscheduling a fallback or default downlink data channel, as an example,DCI format 1_0) and the resource allocation scheme for the uplink datachannel scheduled through another one of the DCI formats for schedulingthe downlink data channel (e.g., DCI for scheduling a general downlinkdata channel, as an example, DCI format 1_1) may be identical to ordifferent from each other.

That is, the NR system will be described as an example. It may bedetermined that the uplink control channel that transmits the receptionresult of the downlink data channel scheduled through format 1_0 that isone of the DCI formats for scheduling the downlink data channel or aresponse signal is transmitted in accordance with the first scheme, andthe uplink control channel that transmits the reception result of thedownlink data channel scheduled through format 1_1 that is another oneof the DCI formats for scheduling the downlink data channel or aresponse signal is transmitted in accordance with the second scheme. Inthis case, the DCI formats 1-0 and 1_1 are merely exemplary, and themethod may be able to be applied even to another DCI format.

Further, the waveforms applied during PUCCH transmission in accordancewith the uplink control channel (PUCCH) format may differ, and as anexample, if the terminal transmits the PUCCH using the DFT-s-OFDMwaveform, the terminal may determine that the resource allocation forthe uplink control channel corresponds to the first scheme. Further, inthe case of transmitting the PUCCH using the CP-OFDM waveform, theterminal may determine that the resource allocation for the uplinkcontrol channel corresponds to the second scheme.

Method 4-3: Indication of a Resource Allocation Scheme Through DCI

The method 4-3 is a method for determining the resource allocationscheme for the uplink control channel for transmitting the PDSCHreception result using at least one field value among fields included inthe DCI for scheduling the PDSCH reception.

For example, fields indicating the resource allocation scheme for theuplink control channel are introduced in the DCI, and the terminal maydetermine the resource allocation scheme for the uplink control channelindicated or scheduled in accordance with the field value. For example,a resource allocation type indicator having a size of one bit may beseparately added to the DCI, or the indicator having the size of one bitmay be added to the field indicating the uplink control channelinformation, and if the field value is 0, it may be indicated that theresource allocation scheme for the uplink control is the first scheme,whereas if the field value is 1, it may be indicated that the resourceallocation scheme for the uplink control channel is the second scheme.In this case, the resource allocation scheme indicated by the name andthe size of the field and the bit value is merely exemplary.

Method 4-4: Determination of the Transmission Frequency ResourceAllocation Scheme Depending on Whether the Uplink Data Channel ScheduledThrough the UL Grant is Transmitted within the Channel Occupancy Time ofthe Base Station

Hereinafter, the method 4-4 will be described in more detail. The method4-4 is a method for determining the transmission frequency resourceallocation scheme of the uplink control channel depending on whether theuplink control channel is transmitted within the channel occupancy timeof the base station. Through the method, the transmission frequencyresource allocation schemes of the uplink control channel may beidentical to or different from each other depending on whether theuplink control channel is transmitted within the channel occupancy timeof the base station or in the time except the channel occupancy time ofthe base station, and as a result, the transmission frequency resourceallocation scheme of the uplink control channel may be identical to ordifferent from the transmission frequency resource allocation scheme ofthe uplink control channel indicated or configured through at least oneof the method 4-1, method 4-2, or method 4-3.

It is preferable that the base station controls the uplink signaltransmission of terminals within the channel occupancy time in which thebase station accesses and uses the channel after performing the channelaccess procedure. For example, the base station may transmit the ULgrant to one or more terminals on the downlink control channel, and theterminal having received this may transmit the uplink data channel inaccordance with the UL grant. Further, the base station may indicate totransmit the uplink control channel (PUCCH) or the data channel (PUSCH)to one or more terminals, and the uplink signals and channels may bemultiplexed. Accordingly, the base station is required to make theuplink signals and channels transmitted by the terminals in at least oneslot or a transmission time interval be effectively multiplexed bymaking the uplink signals and channels have the same resource allocationscheme in at least the channel occupancy time. Accordingly, a method isnecessary, in which the transmission frequency resource allocationschemes are independently configured depending on whether at least theuplink control channel is transmitted within the channel occupancy timeof the base station.

For example, the terminal may transmit the uplink control channel usingthe transmission resource allocation scheme (e.g., first scheme) in caseof transmitting the uplink control channel within the channel occupancytime of the base station and the transmission resource allocation scheme(e.g., second scheme) in case of transmitting the uplink control channelin the time except the channel occupancy time of the base station. Inthis case, the transmission resource allocation scheme in case oftransmitting the uplink control channel in the time except the channeloccupancy time of the base station may be predefined between the basestation and the terminal (e.g., default resource allocation scheme), andthe transmission resource allocation scheme (e.g., first scheme) in caseof transmitting the uplink control channel within the channel occupancytime of the base station may be configured or enabled by the basestation through the system information or the higher signal or the DCIfor scheduling the PDSCH. Similarly, the transmission resourceallocation scheme in case of transmitting the uplink control channelwithin the channel occupancy time of the base station may be predefinedbetween the base station and the terminal (e.g., default resourceallocation scheme), and the transmission resource allocation scheme(e.g., first scheme) in case of transmitting the uplink control channelin the time except the channel occupancy time of the base station may beconfigured or enabled by the base station through the system informationor the higher signal or the DCI for scheduling the PDSCH. In this case,the transmission resource allocation scheme in case of transmitting theuplink control channel in the time except the channel occupancy time ofthe base station may be configured through the DCI for scheduling thePDSCH (e.g., second scheme), and the transmission resource allocationscheme (e.g., first scheme) in case of transmitting the uplink controlchannel within the channel occupancy time of the base station may beconfigured or enabled through the system information or the highersignal. Similarly, the transmission resource allocation scheme in caseof transmitting the uplink control channel within the channel occupancytime of the base station may be configured through the DCI forscheduling the PDSCH (e.g., first scheme), and the transmission resourceallocation scheme (e.g., second scheme) in case of transmitting theuplink control channel in the time except the channel occupancy time ofthe base station may be configured or enabled through the systeminformation or the higher signal.

Further, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the uplink controlchannel within the channel occupancy time of the base station, or if thetransmission resource allocation scheme is not enabled, the terminal mayapply the transmission resource allocation scheme in case oftransmitting the uplink control channel in the time except the channeloccupancy time of the base station even to a case of transmitting theuplink control channel within the channel occupancy time of the basestation. Similarly, the transmission resource allocation scheme in caseof transmitting the uplink control channel within the channel occupancytime of the base station may be predefined between the base station andthe terminal (e.g., default resource allocation scheme), and thetransmission resource allocation scheme (e.g., first scheme) in case oftransmitting the uplink control channel in the time except the channeloccupancy time of the base station may be configured or enabled by thebase station through the system information or the higher signal. Inthis case, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the uplink controlchannel in the time except the channel occupancy time of the basestation, or if the scheme is not enabled, the terminal may apply thetransmission resource allocation scheme in case of transmitting theuplink control channel within the channel occupancy time of the basestation even to a case of transmitting the uplink control channel in thetime except the channel occupancy time of the base station.

As described above, the terminal may determine the transmission resourceallocation scheme (e.g., first scheme) in case of transmitting theuplink control channel within the channel occupancy time of the basestation and the transmission resource allocation scheme (e.g., secondscheme) in case of transmitting the uplink control channel in the timeexcept the channel occupancy time of the base station, and the terminalmay determine whether the uplink data channel transmission time or thetransmission slot is a time within the channel occupancy time of thebase station or a time except the channel occupancy time, and theterminal may transmit the uplink data channel through a correcttransmission resource allocation scheme in accordance with the result ofthe determination. In this case, the terminal may determine whether thebase station occupies the channel or whether the base station accessesthe channel depending on whether to detect a reference signal (e.g.,DMRS) transmitted by the base station, or the terminal may determinewhether the base station occupies the channel through reception ofinformation on whether the base station accesses the channel orinformation on the channel occupancy time of the base station that aretransmitted by the base station through the downlink control channel.

In this case, the information on whether the base station accesses thechannel or information on the channel occupancy time may be composed ofnot only information on at least one bandwidth part and one transmissioninterval or slot but also at least one of a plurality of bandwidth partsor a plurality of slots. Further, the information on whether the basestation accesses the channel or information on the channel occupancytime may be composed of information on one or more subband units havinga smaller size than the size of the bandwidth part or information on oneor more mini-slots or transmission time intervals or symbols composed ofsymbols that are smaller than the slots. Such information on whether thebase station accesses the channel or information on the channeloccupancy time may refer to FIG. 9A.

Method 4-5: Usage of the Same Resource Allocation Scheme as that of anUplink Data Channel

The method 4-5 is a method in which the terminal transmits the uplinkcontrol channel by applying the same scheme as the transmissionfrequency resource allocation scheme for the uplink data channelscheduled through the UL grant indicated or determined through one ormore of various methods according to embodiment 3 of the disclosure. Themethod 4-5 has the advantage that additional information for indicatingor configuring the transmission frequency resource allocation scheme forthe uplink control channel is not necessary, and according to thismethod, all the uplink data channels and the uplink control channels canuse the same transmission frequency resource allocation scheme.

In this case, it is also possible that the terminal includes the methodfor transmitting the uplink control channel by applying the same schemeas the transmission frequency resource allocation scheme for the uplinkdata channel scheduled through the RAR UL grant indicated or determinedthrough one or more of the various methods according to embodiment 3 ofthe disclosure.

(4-2)-th Embodiment

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes.According to this method, the terminal receives DCI for schedulingdownlink data channel (PDSCH) from the base station, and in case oftransmitting the reception result of the received PDSCH or responsesignal (HARQ-ACK) information on an uplink control channel (PUCCH), theterminal determines PUCCH transmission resources in case that thetransmission frequency resource allocation scheme for the uplink controlchannel determined or configured according to the fourth embodiment isthe frequency resource allocation scheme of the second scheme. Inembodiment 4-2, a case where the terminal transmit the reception resultof the received PDSCH or response signal (HARQ-ACK) information on theuplink control channel (PUCCH) will be described as an example, but thisembodiment will be able to be applied even to a case where channel stateinformation is transmitted through the uplink control channel (PUCCH).

If the frequency resource allocation scheme of the second scheme isconfigured as the PUCCH frequency resource allocation scheme withrespect to the PUCCH transmission, or if the frequency resourceallocation scheme of the second scheme is enabled, the terminal may beallocated with the PUCCH resource in the unit of uplink control channelresource #k. In other words, one uplink control channel resource becomesa base transmission frequency resource of the PUCCH transmission. Forexample, the terminal may be allocated with the uplink control channelresource index #3 940 in FIG. 9B as a frequency resource of PUCCH #m,and the terminal may transmit PUCCH #m using a PRB included in theuplink control channel resource #3 940. At this time, the uplink controlchannel resource may be independently configured for each PUCCHresource, and it can also be configured independently for each PUCCHformat or PUCCH resource set.

In this case, in case of transmitting a large quantity of information(payload) through the PUCCH, the terminal may require a larger quantityof PUCCH resources. Accordingly, it is necessary for the terminal to beallocated with a plurality of uplink control channel resources in PUCCHresource index #m. Hereinafter, in the disclosure, explanation will bemade on the assumption that two uplink control channel resources areallocated, but the disclosure is not limited thereto.

The terminal may be allocated with one uplink control channel resourceor two uplink control channel resources with respect to PUCCH resource#m. If the terminal is configured to use two uplink control channelresources with respect to PUCCH resource #m, the terminal may implicitlyor explicitly determine the second uplink control channel resource usingthe first uplink control channel resource.

For example, as described above, the terminal that is allocated withuplink control channel resource #k as the resource for the PUCCH #m maydetermine the second uplink control channel resource through thefollowing methods.

Method 1: This method determines, with respect to PUCCH resource #m, aresource or a resource index just next to the first uplink controlchannel resource (e.g., interlace 0) configured through a higher signalas the second uplink control channel resource (e.g., interlace 1) ofPUCCH resource #m.

For example, if the terminal is allocated with uplink control channelresource #k as the first uplink control channel resource (interlace 0)with respect to PUCCH #m through the higher signal, the terminal maydetermine that the next index #k+1 of the uplink control channelresource is the second uplink control channel resource (interlace 1). Inthis case, if total M effective uplink control channel resources exist,it may be possible that the terminal determines the second uplinkcontrol channel resource through modulo operations of an index next tothe index configured as the first uplink control channel resource andthe M control channel resources with respect to PUCCH #m through thehigher signal. That is, the terminal, which have been configured withthe first uplink control channel resource (e.g., interlace 0) #k throughthe higher signal as the resource for PUCCH #m, may determine that theindex of the second uplink control channel resource is modulo (k+1, M).

Method 2: This method determines the second uplink control channelresource (e.g., interlace 1) of PUCCH resource #m using the first uplinkcontrol channel resource (e.g., interlace 0) configured through thehigher signal with respect to PUCCH resource #m and offset information.

For example, the terminal may be configured with the first uplinkcontrol channel resource (interlace 0) for PUCCH #m and an additionaloffset value i for the second uplink control channel resourcedetermination through the higher signal. In this case, the terminal maydetermine #k+i, to which the offset value is applied, based on theconfigured first uplink control channel resource #k as the index of thesecond uplink control channel resource (interlace 0). In this case, theoffset i may be an integer including a negative number, 0, and apositive number, or it may be a positive integer that is equal to orlarger than 0.

In this case, in the same manner as method 1, if total M effectiveuplink control channel resources exist, it is possible that the terminaldetermines the second uplink control channel resource through the modulooperation of the first uplink control channel resource (interlace 0)index for PUCCH #m configured through the higher signal, the uplinkcontrol channel resource (interlace 1) index determined through theoffset information, and the number M of control channel resources. Thatis, the terminal, which is configured with the first uplink controlchannel resource (e.g., interlace 0) #k through the higher signal as theresource for PUCCH #m, may determine that the index of the second uplinkcontrol channel resource is modulo (k+i, M).

Method 3: This method is configured with all the first uplink controlchannel resource (e.g., interlace 0) and the second uplink controlchannel resource (interlace 1) for PUCCH resource #m through the highersignal.

Even in case that two or a plurality uplink control channel resourcesare configured, the terminal may transmit the PUCCH using only oneuplink control channel resource if the quantity of information (payload)to be actually transmitted is small. For example, the terminal mayperform the PUCCH transmission using the minimum number of PRBs capableof satisfying the code rate that is equal to or higher than the coderate configured to uplink control information (UCI) transmissiontransmitted through the PUCCH or the code rate determined for the UCItransmission. In this case, in case of the uplink control channel usingthe frequency resource allocation scheme of the second scheme, theminimum frequency allocation resource is the uplink control channelresource (in case of FIG. 9B, uplink control channel resource #0 930 oruplink control channel resource #3 940), and thus the terminal maytransmit the uplink control channel using the minimum uplink controlchannel resource (or interlace) capable of satisfying the code rate thatis equal to or higher than the code rate configured for the UCItransmission transmitted on the PUCCH or determined for the UCItransmission. That is, if the terminal is configured with two uplinkcontrol channels in PUCCH resource #m, and the above-described minimumuplink control channel resource is one uplink control channel, theterminal transmits the UCI using one of the two configured uplinkcontrol channels. In this case, the terminal may select the uplinkcontrol channel resource to be used for actual transmission among thetwo uplink control channel resources configured in PUCCH resource #mthrough selection of one or a combination of the two uplink controlchannel resources.

Method A: The terminal may select the uplink control channel resourcehaving the lowest uplink control channel resource index or the uplinkcontrol channel resource having the highest uplink control channelresource index, and it may transmit the UCI using the selected uplinkcontrol channel resource.

Method B: The terminal may transmit the uplink control channel using theuplink control channel resource configured through the higher signal.

The terminal may transmit the UCI using the uplink control channelresource configured with the uplink control channel resource index orthe first uplink control channel resource (interlace 0) among aplurality of uplink control channel resources of PUCCH resource #m. Forexample, in case of the method 2, the first uplink control channel amongthe uplink control channel resources of PUCCH resource #m is theresource of which the corresponding resource index (interlace 0) isconfigured through the higher signal. The second uplink control channelamong the uplink control channel resources of PUCCH resource #m is theuplink control channel resource determined or configured using the firstuplink control channel and the offset information. In this case, themethod B transmits the uplink control channel using the uplink controlchannel resource configured with the uplink control channel resourceindex or the first uplink control channel resource (interlace 0) amongthe uplink control channel resources of PUCCH #m, and thus the terminaltransmits the UCI using the first uplink control channel (interlace 0)among the uplink control channel resources of PUCCH resource #m.

If a plurality of uplink control channel resources configured with theuplink control channel resource indexes exist, as in the method A, theterminal may select the uplink control channel resource having thelowest uplink control channel resource index and the uplink controlchannel resource having the highest uplink control channel resourceindex, and it may transmit the uplink control channel using the selecteduplink control channel resources.

In this case, like the method 2, the method B is more effective inconfiguring the second uplink control channel resource through theoffset. For example, it is assumed that the base station configures twouplink control channel resource #0 and #1 to two terminals, and the twoterminals share and use the resources. In this case, the base stationmay configure uplink control channel resource #0 and offset 1 toterminal #0, and it may configure uplink control channel resource #1 andoffset −1 to terminal #1. If the uplink control channel resourcerequired for the actual UCI transmission is smaller than the uplinkcontrol channel resource configured on the PUCCH resource in terminal #0and terminal #1, the terminal transmits the UCI using the uplink controlchannel resource configured with the uplink control channel resourceindex or the first uplink control channel resource according to themethod B. In this case, terminal #0 transmits the UCI through the uplinkcontrol channel resource #0 and terminal #1 transmits the UCI throughthe uplink control channel resource #1, and thus the two terminals cantransmit the UCI on different resources without overlapping.

Method C: The terminal is configured with the uplink control channelresource to be used for actual transmission through the higher signal,and it transmits the uplink control channel through the configureduplink control channel resource.

Even if a plurality of uplink control channel resources for PUCCHresource #m are configured to the terminal, the uplink control channelresource required for the actual UCI transmission may be smaller thanthe uplink control channel resource configured for PUCCH resource #m. Inthis case, the terminal transmits the UCI through selection of some ofthe plurality of resources configured. The method C is a method in whichthe terminal is configured with information on the uplink controlchannel resource used for the actual UCI transmission among a pluralityof uplink control channel resources or the corresponding index throughthe higher signal if the uplink control channel resource required forthe actual UCI transmission is smaller than the configured uplinkcontrol channel resource. For example, the terminal may be configuredwith two uplink control channel resources (interlace 0 and interlace 1)included in PUCCH resource #m through the higher signal. In addition, ifthe uplink control channel resource required for the actual UCItransmission is smaller than the plurality of configured uplink controlchannel resources, the terminal may be configured with the uplinkcontrol channel resource used for the UCI transmission or correspondingindex information (e.g., interlace 1). In other words, if one uplinkcontrol channel resource is required for the actual UCI transmissionthrough PUCCH #m, the terminal may transmit the actual UCI using theuplink control channel resource (interlace 1) configured through thehigher signal of the two uplink control channel resources (interlace 0and interlace 1) configured on the PUCCH #m. The uplink control channelresource to be used for the actual UCI transmission or index information(or preferential uplink control channel resource or index) may beindicated from the base station to the terminal through the DCI.

Fifth Embodiment

In this embodiment, a method is proposed, in which a base station and aterminal support a plurality of frequency resource allocation schemes.According to this method, the terminal determines a transmissionfrequency resource allocation scheme for a sounding reference signal(SRS) in case that the terminal transmits the sounding reference signalto the base station.

Method 5-1: Configuration of a Transmission Frequency ResourceAllocation Scheme of an Uplink Control Channel Through SystemInformation or a Higher Signal

Hereinafter, the method 5-1 will be described in more detail. The method5-1 is a method in which the base station indicates or configures thetransmission frequency resource allocation scheme of the soundingreference signal to the terminal through system information or a highersignal. As the base station indicates or configures the transmissionfrequency resource allocation scheme of the sounding reference signalthrough the system information, all terminals may transmit the soundingreference signal in the same frequency resource allocation scheme in abandwidth part in which the sounding reference signal is transmitted. Inthis case, the transmission frequency resource allocation scheme of thesounding reference signal may be included in sounding reference signalrelated configuration information (e.g., srs-config) to be transmittedto the terminal. In this case, a default frequency allocation schemebetween the base station and the terminal may be predefined. Forexample, the first scheme may be the transmission frequency resourceallocation scheme of the default sounding reference signal, and thefrequency resource allocation scheme of a scheme except the firstscheme, for example, the frequency resource allocation scheme of thesecond scheme, may be enabled through the system information or thehigher signal. If the frequency resource allocation scheme of the schemeexcept the first scheme, for example, the second scheme, is not enabledthrough the system information or the higher signal, in other words, ifthe frequency resource allocation scheme of the second scheme isdisabled, the terminal may determine that the transmission frequencyresource allocation scheme of the sounding reference signal is thedefault frequency resource allocation scheme.

If the frequency resource allocation scheme of the second scheme isenabled, the terminal determines the second scheme as the transmissionfrequency resource allocation scheme of the sounding reference signal.In this case, if the frequency resource allocation scheme of the secondscheme is enabled, the terminal may also determine that the both thefirst scheme and the second scheme are the transmission frequencyresource allocation scheme of the sounding reference signal, and in thiscase, the transmission frequency resource allocation scheme that shouldbe used by the terminal during transmission of the sounding referencesignal may be indicated through the DCI (in other words, DCI forindicating transmission of the sounding reference signal) for indicatingor scheduling the uplink control channel, or it may be determinedthrough at least one of other methods proposed in embodiment 5. Here,the DCI for indicating or scheduling the transmission of the soundingreference signal may mean a case where one field indicates, requests, ortriggers the transmission of the sounding reference signal among DCI forscheduling reception of the downlink data channel (PDSCH) transmitted bythe base station, DCI for scheduling transmission of an uplink datachannel (PUSCH), UL grant information, or group common DCI forindicating the transmission of the sounding reference signal to one ormore terminals.

Further, the transmission frequency resource allocation scheme of thesounding reference signal may be configured to resources of the soundingreference signal configured through the system information or the highersignal or a set of sounding reference signal resources. That is, thebase station can configure the frequency resource allocation schemes ofthe sounding reference signal resource #0 and sounding reference signal#1 so that the frequency resource allocation schemes of the soundingreference signal resource #0 and the sounding reference signal resource#1 are identical to or different from each other.

Method 5-2: Determination of a Resource Allocation Scheme in Accordancewith Waveform Configuration for an Uplink Data Channel

Terminal may determine the resource allocation scheme of the soundingreference signal in accordance with the waveform configuration for theuplink data channel scheduled through RAR UL grant or UL grant. Forexample, if the waveform for the uplink data channel is configured as aDFT-s-OFDM waveform, the terminal may determine that the resourceallocation for the sounding reference signal corresponds to the firstscheme. If the waveform for the uplink data channel is configured as aCP-OFDM waveform, the terminal may determine that the resourceallocation for the sounding reference signal corresponds to the secondscheme.

Similarly, the terminal may determine the resource allocation scheme ofthe sounding reference signal in accordance with the waveformconfiguration for the uplink control channel. For example, if thewaveform for the uplink data channel is configured as a DFT-s-OFDMwaveform, the terminal may determine that the resource allocation forthe sounding reference signal corresponds to the first scheme. If thewaveform for the uplink data channel is configured as a CP-OFDMwaveform, the terminal may determine that the resource allocation forthe sounding reference signal corresponds to the second scheme. If oneor more waveforms are used to transmit the uplink control channel inaccordance with the format of the uplink control channel, the terminalmay determine the resource allocation scheme of the sounding referencesignal in accordance with the waveform configuration for the uplink datachannel.

Method 5-3: Indication of a Resource Allocation Scheme Through DCI

The method 5-3 is a method for determining the resource allocationscheme for the sounding reference signal through a sounding referencesignal transmission request field (SRS request field) included in theDCI indicating the transmission of the sounding reference signal. Forexample, fields of values indicating the resource allocation scheme areintroduced in the values of sounding reference signal transmissionrequest fields, and the terminal may determine the resource allocationscheme for the indicated or scheduled sounding reference signal inaccordance with the field value. For example, a resource allocation typeindicator having a size of one bit may be separately added to the DCIfor indicating or requesting the transmission of the sounding referencesignal, or the indicator having the size of one bit may be added to thefield indicating the transmission of the sounding reference signal (SRSrequest field), and if the field value is 0, it may be indicated thatthe resource allocation scheme for the sounding reference signal is thefirst scheme, whereas if the field value is 1, it may be indicated thatthe resource allocation scheme for the sounding reference signal is thesecond scheme. In this case, the resource allocation scheme indicated bythe name and the size of the field and the bit value is merelyexemplary.

Method 5-4: Determination of the Transmission Frequency ResourceAllocation Scheme Depending on Whether the Uplink Control Channel isTransmitted within the Channel Occupancy Time of the Base Station

Hereinafter, the method 5-4 will be described in more detail. The method5-4 is a method for determining the transmission frequency resourceallocation scheme of the sounding reference signal depending on whetherthe sounding reference signal is transmitted within the channeloccupancy time of the base station. Through the method, the transmissionfrequency resource allocation schemes of the sounding reference signalmay be identical to or different from each other depending on whetherthe sounding reference signal is transmitted within the channeloccupancy time of the base station or in the time except the channeloccupancy time of the base station, and as a result, the transmissionfrequency resource allocation scheme of the sounding reference signalmay be identical to or different from the transmission frequencyresource allocation scheme of the sounding reference signal indicated orconfigured through at least one of the method 5-1, method 5-2, or method5-3.

It is preferable that the base station controls the uplink signaltransmission of terminals within the channel occupancy time in which thebase station accesses and uses the channel after performing the channelaccess procedure. For example, the base station may transmit the ULgrant to one or more terminals on the downlink control channel, and theterminal having received this may transmit the uplink data channel inaccordance with the UL grant. Further, the base station may indicate totransmit the uplink control channel (PUCCH) or the data channel (PUSCH)to one or more terminals, and the uplink signals and channels may bemultiplexed. Accordingly, the base station is required to make theuplink signals and channels transmitted by the terminals in at least oneslot or a transmission time interval be effectively multiplexed bymaking the uplink signals and channels have the same resource allocationscheme in at least the channel occupancy time. Accordingly, a method isnecessary, in which the transmission frequency resource allocationschemes are independently configured depending on whether at least theuplink control channel is transmitted within the channel occupancy timeof the base station.

For example, the terminal may transmit the sounding reference signalusing the transmission resource allocation scheme (e.g., first scheme)in case of transmitting the sounding reference signal within the channeloccupancy time of the base station and the transmission resourceallocation scheme (e.g., second scheme) in case of transmitting thesounding reference signal in the time except the channel occupancy timeof the base station. In this case, the transmission resource allocationscheme in case of transmitting the sounding reference signal in the timeexcept the channel occupancy time of the base station may be predefinedbetween the base station and the terminal (e.g., default resourceallocation scheme), and the transmission resource allocation scheme(e.g., first scheme) in case of transmitting the sounding referencesignal within the channel occupancy time of the base station may beconfigured or enabled by the base station through the system informationor the higher signal or the DCI for indicating or requesting thetransmission of the sounding reference signal. Similarly, thetransmission resource allocation scheme in case of transmitting thesounding reference signal within the channel occupancy time of the basestation may be predefined between the base station and the terminal(e.g., default resource allocation scheme), and the transmissionresource allocation scheme (e.g., first scheme) in case of transmittingthe sounding reference signal in the time except the channel occupancytime of the base station may be configured or enabled by the basestation through the system information or the higher signal or the DCIfor indicating or requesting the transmission of the sounding referencesignal. In this case, the transmission resource allocation scheme incase of transmitting the sounding reference signal in the time exceptthe channel occupancy time of the base station may be configured throughthe DCI for indicating or requesting the transmission of the soundingreference signal (e.g., second scheme), and the transmission resourceallocation scheme (e.g., first scheme) in case of transmitting thesounding reference signal within the channel occupancy time of the basestation may be configured or enabled through the system information orthe higher signal. Similarly, the transmission resource allocationscheme in case of transmitting the sounding reference signal within thechannel occupancy time of the base station may be configured through theDCI for indicating or requesting the transmission of the soundingreference signal (e.g., first scheme), and the transmission resourceallocation scheme (e.g., second scheme) in case of transmitting thesounding reference signal in the time except the channel occupancy timeof the base station may be configured or enabled through the systeminformation or the higher signal.

Further, if the terminal is not configured with the transmissionresource allocation scheme in case of transmitting the soundingreference signal within the channel occupancy time of the base station,or if the transmission resource allocation scheme is not enabled, theterminal may apply the transmission resource allocation scheme in caseof transmitting the sounding reference signal in the time except thechannel occupancy time of the base station even to a case oftransmitting the sounding reference signal within the channel occupancytime of the base station. Similarly, the transmission resourceallocation scheme in case of transmitting the sounding reference signalwithin the channel occupancy time of the base station may be predefinedbetween the base station and the terminal (e.g., default resourceallocation scheme), and the transmission resource allocation scheme(e.g., first scheme) in case of transmitting the sounding referencesignal in the time except the channel occupancy time of the base stationmay be configured or enabled by the base station through the systeminformation or the higher signal. In this case, if the terminal is notconfigured with the transmission resource allocation scheme in case oftransmitting the sounding reference signal in the time except thechannel occupancy time of the base station, or if the scheme is notenabled, the terminal may apply the transmission resource allocationscheme in case of transmitting the sounding reference signal within thechannel occupancy time of the base station even to a case oftransmitting the sounding reference signal in the time except thechannel occupancy time of the base station.

As described above, the terminal may determine the transmission resourceallocation scheme (e.g., first scheme) in case of transmitting thesounding reference signal within the channel occupancy time of the basestation and the transmission resource allocation scheme (e.g., secondscheme) in case of transmitting the sounding reference signal in thetime except the channel occupancy time of the base station, and theterminal may determine whether the uplink data channel transmission timeor the transmission slot is a time within the channel occupancy time ofthe base station or a time except the channel occupancy time, and theterminal may transmit the sounding reference signal through a correcttransmission resource allocation scheme in accordance with the result ofthe determination. In this case, the terminal may determine whether thebase station occupies the channel or whether the base station accessesthe channel depending on whether to detect a reference signal (e.g.,DMRS) transmitted by the base station, or the terminal may determinewhether the base station occupies the channel through reception ofinformation on whether the base station accesses the channel orinformation on the channel occupancy time of the base station that aretransmitted by the base station through the downlink control channel.

In this case, the information on whether the base station accesses thechannel or information on the channel occupancy time may be composed ofnot only information on at least one bandwidth part and one transmissioninterval or slot but also at least one of a plurality of bandwidth partsor a plurality of slots. Further, the information on whether the basestation accesses the channel or information on the channel occupancytime may be composed of information on one or more subband units havinga smaller size than the size of the bandwidth part or information on oneor more mini-slots or transmission time intervals or symbols composed ofsymbols that are smaller than the slots. Such information on whether thebase station accesses the channel or information on the channeloccupancy time may refer to FIG. 9A.

Method 5-5: Usage of the Same Resource Allocation Scheme as that of anUplink Data Channel

The method 5-5 is a method in which the terminal transmits the soundingreference signal by applying the same scheme as the transmissionfrequency resource allocation scheme for the uplink data channelscheduled through the UL grant indicated or determined through one ormore of various methods according to embodiment 3 of the disclosure. Themethod 5-5 has the advantage that additional information for indicatingor configuring the transmission frequency resource allocation scheme forthe sounding reference signal is not necessary, and according to thismethod, all the uplink data channels and the sounding reference signalscan use the same transmission frequency resource allocation scheme. Inparticular, in case that the uplink data channel and the soundingreference signal are successively transmitted, the uplink data channeland the sounding reference signal are made to use the same transmissionfrequency resource allocation scheme, and thus an unnecessary change ofthe resource allocation scheme can be avoided. In this case, it is alsopossible that the method 5-5 includes a method by the terminal fortransmitting the sounding reference signal by applying the same schemeas the transmission frequency allocation scheme for the uplink controlchannel scheduled through the RAR UL grant indicated or determinedthrough one or more of various methods of embodiment 2 and embodiment 3of the disclosure.

According to the various embodiments of the disclosure, although themethod for determining the resource allocation scheme for the uplinksignals or channels has been provided, it is also possible to determinethe resource allocation scheme for one or more uplink signals orchannels through combination and modification of one or moreembodiments. Further, in the disclosure, although the method fordetermining the resource allocation scheme for respective uplink signalsor channels has been described on the assumption that the resourceallocation schemes for the respective uplink signals or channels areindependently indicated or configured, the resource allocation schemefor the uplink signals or channels may be commonly applied to all theuplink signals or channels transmitted in the uplink carrier, uplinkcell, or uplink bandwidth part, and in this case, it may be determinedthat the resource allocation schemes for the uplink signals or channelsindicated or configured in the uplink carrier, uplink cell, or uplinkbandwidth part are applied rather than indication or configuration forthe respective uplink signals or channels.

In the disclosure, although the method for determining the resourceallocation scheme for the respective uplink signals or channels inaccordance with the waveform configuration configured or defined in therespective uplink signals or channels is provided, the waveformconfiguration for the uplink signals or channels can be commonly appliedto all the uplink signals or channels being transmitted in an uplinkcarrier, uplink cell, or uplink bandwidth part. In this case thewaveform configuration for the uplink signals or channels may be thewaveform configuration for the uplink signals or channels indicated orconfigured in the uplink carrier, the uplink cell, or the uplinkbandwidth part rather than the configurations for the uplink signals orchannels, and the resource allocation scheme for the respective uplinksignals or channels may be determined based on the configured waveform.

Further, in the disclosure, the default transmission frequency resourceallocation scheme between the base station and the terminal means thatthe frequency resource allocation scheme for a part or the whole of theuplink signal or channel has been predefined between the base stationand the terminal. In this case, the default transmission frequencyresource allocation scheme may be one of uplink resource allocation type0, uplink resource allocation type 1, and uplink resource allocationtype 2, or a combination or a modification of the resource allocationschemes, and it may be determined in accordance with the uplinktransmission signals or channels, or the waveforms of the uplinktransmission signals or channels.

FIG. 10 is a flowchart of a base station for determining a method forallocating a frequency domain resource in a wireless communicationsystem according to an embodiment of the disclosure. The base station isexemplified by the base station 110 of FIG. 1 .

Referring to FIG. 10 , at operation 1000, the base station may determinethe frequency resource allocation scheme for an uplink signal and achannel. For example, the frequency resource allocation schemes for theuplink signal and the channel may be identical to or different from eachother depending on whether the uplink signal and the channel are thesignal and the channel transmitted in an unlicensed band or in alicensed band. As an example, if the uplink signal and the channel arethe signal and the channel transmitted in the unlicensed band, themethod according to the disclosure including uplink frequency resourceallocation type 1, type 2, or type 3 may be used as the frequencyresource allocation scheme for the uplink signal and the channel. If theuplink signal and the channel are the signal and the channel transmittedin the licensed band, the method according to the disclosure includinguplink frequency resource allocation type 0 and type 1 may be used asthe frequency resource allocation scheme for the uplink signal and thechannel. Further, at operation 1000, the base station may configureconfiguration information required to transmit/receive the uplink signaland the channel including the bandwidth part related configuration. Inthis case, the base station may indicate or configure the frequencyresource allocation scheme for the uplink signal and the channel of theterminal in accordance with various embodiments and methods of thedisclosure.

Thereafter, the base station, at operation 1010, may transmit, to one ormore terminals, configuration information required fortransmission/reception of the configured uplink signal and channelthrough system information, system information block (SIB), or a highersignal. Thereafter, at operation 1020, the base station may transmit thedownlink signal and the channel to the terminal in accordance withconfiguration information required for transmission/reception of theconfigured uplink signal and channel, or it may receive the uplinksignal and the channel from the terminal.

FIG. 11 is a flowchart of a terminal for determining a method forallocating a frequency domain resource in a wireless communicationsystem according to an embodiment of the disclosure. The terminal isexemplified by the terminal 120 or 130 of FIG. 1 .

Referring to FIG. 11 , at operation 1100, the terminal may receive, fromthe base station, configuration information about the frequency resourceallocation scheme for the uplink signal and the channel configured bythe base station through at least one of a system information block or ahigher signal. In this case, the frequency resource allocation schemesfor the uplink signal and the channel may be identical to or differentfrom each other depending on whether the uplink signal and the channelare the signal and the channel transmitted in an unlicensed band or in alicensed band. More specifically, if the uplink signal and the channelare the signal and the channel transmitted in the unlicensed band, thebase station may configure the method according to the disclosureincluding uplink frequency resource allocation type 1, type 2, or type 3as the frequency resource allocation scheme for the uplink signal andthe channel. If the uplink signal and the channel are the signal and thechannel transmitted in the licensed band, the method according to thedisclosure including uplink frequency resource allocation type 0 andtype 1 may be configured as the frequency resource allocation scheme forthe uplink signal and the channel. Further, at operation 1100, theterminal may receive configuration information required fortransmission/reception of the uplink signal and the channel configuredby the base station including the bandwidth part related configuration.Thereafter, at operation 1110, the terminal may configure variablesrequired for transmission of the uplink signal and the channel includingthe frequency resource allocation scheme in accordance with theconfiguration information received at operation 1100. At operation 1120,the terminal may transmit the uplink signal and the channel inaccordance with the frequency resource allocation type configured atoperation 1110.

FIG. 12 is another flowchart of a terminal for determining a method forallocating a frequency domain resource in a wireless communicationsystem according to an embodiment of the disclosure. The terminal isexemplified by the terminal 120 or 130 of FIG. 1 .

Referring to FIG. 12 , at operation 1200, the terminal may receive, fromthe base station, configuration information about the frequency resourceallocation scheme for the uplink signal and the channel configured bythe base station through at least one of a system information block or ahigher signal. In this case, the frequency resource allocation schemesfor the uplink signal and the channel may be identical to or differentfrom each other depending on whether the uplink signal and the channelare the signal and the channel transmitted in an unlicensed band or in alicensed band. More specifically, if the uplink signal and the channelare the signal and the channel transmitted in the unlicensed band, thebase station may configure the method according to the disclosureincluding uplink frequency resource allocation type 1, type 2, or type 3as the frequency resource allocation scheme for the uplink signal andthe channel. If the uplink signal and the channel are the signal and thechannel transmitted in the licensed band, the method according to thedisclosure including uplink frequency resource allocation type 0 andtype 1 may be configured as the frequency resource allocation scheme forthe uplink signal and the channel.

If the uplink signal and the channel are transmitted in the unlicensedband, the terminal may be configured with the frequency resourceallocation scheme of the uplink signal or the channel in case that theuplink signal and the channel are transmitted within the channeloccupancy time of the base station, and the frequency resourceallocation scheme of the uplink signal or the channel in case that theuplink signal and the channel are transmitted at the time except thechannel occupancy time of the base station. In this case, the frequencyresource allocation scheme of the uplink signal and the channel withrespect to at least one of the frequency resource allocation scheme ofthe uplink signal and the channel in case that the uplink signal and thechannel are transmitted within the channel occupancy time of the basestation and the frequency resource allocation scheme of the uplinksignal and the channel in case that the uplink signal and the channelare transmitted at the time except the channel occupancy time of thebase station (e.g., the uplink signal and the channel are transmitted atthe time except the channel occupancy time of the base station) mayfollow the frequency resource allocation scheme for the uplink datachannel scheduled through the default frequency resource allocation typeor preamble or RAR UL grant, and it is also possible to be allocatedwith the frequency resource allocation scheme of the uplink signal orchannel with respect to another case (e.g., the signal and the channelare transmitted within the channel occupancy time of the base station.

Further, at operation 1200, the terminal may receive configurationinformation required for transmission/reception of the uplink signal andthe channel configured by the base station including the bandwidth partrelated configuration. Thereafter, at operation 1210, the terminal mayidentify and configure variables required for transmission of the uplinksignal and the channel including the frequency resource allocationscheme in accordance with the configuration information received atoperation 1100. Thereafter, the terminal may transmit the uplink signaland the channel in accordance with the frequency resource allocationscheme configured at operation 1210.

Further, at operation 1220, the terminal determines whether transmissionof the uplink signal or the channel is the transmission at a time withinthe channel occupancy time of the base station. If the uplink signal orthe channel is transmitted at a time or slot within the channeloccupancy time of the base station, the terminal, at operation 1240,transmits the signal in accordance with the frequency resourceallocation scheme of the uplink signal or the channel being transmittedat the time or slot within the channel occupancy time of the basestation determined at operation 1200. If the uplink signal or thechannel is transmitted at the time or slot except the channel occupancytime of the base station, the terminal, at operation 1230, transmits thesignal in accordance with the frequency resource allocation scheme ofthe uplink signal or the channel that is transmitted at the time or slotexcept the channel occupancy time of the base station determined atoperation 1200.

In the disclosure, although the expressions “equal to or larger than”and “equal to or smaller than” have been used to determine whether tofulfill a specific condition (or reference), this is merely adescription to express an embodiment, and does not exclude thedescription of “exceeding” or “smaller than”. The condition described as“equal to or larger than” may be replaced by “exceeding”, the conditiondescribed as “equal to or smaller than” may be replaced by “smallerthan”, and the condition described as “equal to or larger than andsmaller than” may be replaced by “exceeding and equal to or smallerthan”.

The methods according to claims of the disclosure and embodimentsdescribed in the description may be implemented in the form of hardware,software, or a combination of hardware and software.

In case of implementing by software, a computer readable storage mediumstoring one or more programs (software modules) may be provided. One ormore programs stored in the computer readable storage medium areconfigured for execution by one or more processors in an electronicdevice. The one or more programs include instructions that cause theelectronic device to execute the methods according to the claims of thedisclosure or embodiments described in the description.

Such a program (software module or software) may be stored in anonvolatile memory including a random access memory and a flash memory,a read only memory (ROM), an electrically erasable programmable readonly memory (EEPROM), a magnetic disc storage device, a compact disc-ROM(CD-ROM), a digital versatile discs (DVDs) or other types of opticalstorage devices, or a magnetic cassette. Further, the program may bestored in a memory composed of a combination of parts or the whole ofthem. Further, a plurality of memories may be included.

Further, the program may be stored in an attachable storage device thatcan be accessed through a communication network such as Internet,Intranet, local area network (LAN), wide LAN (WLAN), or storage areanetwork (SAN) or a communication network composed of a combinationthereof. The storage device may be accessed by a device that performsembodiments of the disclosure through an external port. Further, aseparate storage device on the communication network may access a devicethat performs embodiments of the disclosure.

The disclosure relates to a communication method and system forconverging a 5th-Generation (5G) communication system for supportinghigher data rates beyond a 4th-Generation (4G) system with a technologyfor Internet of Things (IoT). The disclosure may be applied tointelligent services based on the 5G communication technology and theIoT-related technology, such as smart home, smart building, smart city,smart car, connected car, health care, digital education, smart retail,security and safety services.

The embodiments described in this specification have been individuallydescribed, but two or more of the embodiments may be combined andpracticed. For example, parts of the methods proposed in the disclosuremay be combined with each other to operate the base station and theterminal. Further, the above-described embodiments are proposed based ona 5G or NR system, but other modifications based on the technicalconcept of the embodiments will be applicable to other systems such asLTE, LTE-A, and LTE-A-Pro systems.

While the disclosure has been shown and described with reference tovarious embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the disclosure as definedby the appended claims and their equivalents.

What is claimed is:
 1. A method performed by a terminal in acommunication system, the method comprising: receiving, from a basestation, configuration information for a physical uplink control channel(PUCCH), wherein the configuration information includes information on aPUCCH resource including a first interlace index for a first interlaceresource and a second interlace index for a second interlace resource;identifying uplink control information (UCI) to be transmitted;identifying at least one interlace resource for transmitting the UCIbased on a UCI payload size and a code rate associated with the firstinterlace resource; and transmitting, to the base station, the UCI onthe at least one identified interlace resource of the PUCCH.
 2. Themethod of claim 1, wherein in case that a quantity of information bitsdetermined based on the code rate associated with the first interlaceresource and the first interlace resource is equal to or larger than theUCI payload size, the first interlace resource is identified fortransmitting the UCI, and wherein in case that the quantity of theinformation bits determined based on the code rate associated with thefirst interlace resource and the first interlace resource is smallerthan the UCI payload size, the first and second interlace resources areidentified for transmitting the UCI.
 3. The method of claim 1, whereinthe second interlace index is associated with a modulo operation usingthe first interlace index and an offset which is one of predeterminedintegers.
 4. The method of claim 1, wherein information indicating thatinterlace resources are used for uplink transmissions is received viahigher layer signaling.
 5. The method of claim 1, wherein the firstinterlace resource includes a plurality of equally spaced resourceblocks including a first starting resource block based on the firstinterlace index, and wherein the second interlace resource includes aplurality of equally spaced resource blocks including a second startingresource block based on the second interlace index.
 6. A methodperformed by a base station in a communication system, the methodcomprising: transmitting, to a terminal, configuration information for aphysical uplink control channel (PUCCH), wherein the configurationinformation includes information on a PUCCH resource including a firstinterlace index for a first interlace resource and a second interlaceindex for a second interlace resource; and receiving, from the terminal,uplink control information (UCI) on at least one interlace resource ofthe PUCCH, wherein the at least one interlace resource for receiving theUCI is based on a UCI payload size and a code rate associated with thefirst interlace resource.
 7. The method of claim 6, wherein in case thata quantity of information bits determined based on the code rateassociated with the first interlace resource and the first interlaceresource is equal to or larger than the UCI payload size, the firstinterlace resource is used for receiving the UCI, and wherein in casethat the quantity of the information bits determined based on the coderate associated with the first interlace resource and the firstinterlace resource is smaller than the UCI payload size, the first andsecond interlace resources are used for receiving the UCI.
 8. The methodof claim 6, wherein the second interlace index is associated with amodulo operation using the first interlace index and an offset which isone of predetermined integers.
 9. The method of claim 8, whereininformation indicating that interlace resources are used for uplinktransmissions is transmitted via higher layer signaling.
 10. The methodof claim 6, wherein the first interlace resource includes a plurality ofequally spaced resource blocks including a first starting resource blockbased on the first interlace index, and wherein the second interlaceresource includes a plurality of equally spaced resource blocksincluding a second starting resource block based on the second interlaceindex.
 11. A terminal in a communication system, the terminalcomprising: a transceiver; and a controller coupled with the transceiverand configured to: receive, from a base station, configurationinformation for a physical uplink control channel (PUCCH), wherein theconfiguration information includes information on a PUCCH resourceincluding a first interlace index for a first interlace resource and asecond interlace index for a second interlace resource, identifyinguplink control information (UCI) to be transmitted, identifying at leastone interlace resource for transmitting the UCI based on a UCI payloadsize and a code rate associated with the first interlace resource, andtransmitting, to the base station, the UCI on the at least oneidentified interlace resource of the PUCCH.
 12. The terminal of claim11, wherein in case that a quantity of information bits determined basedon the code rate associated with the first interlace resource and thefirst interlace resource is equal to or larger than the UCI payloadsize, the first interlace resource is identified for transmitting theUCI, and wherein in case that the quantity of the information bitsdetermined based on the code rate associated with the first interlaceresource and the first interlace resource is smaller than the UCIpayload size, the first and second interlace resources are identifiedfor transmitting the UCI.
 13. The terminal of claim 11, wherein thesecond interlace index is associated with a modulo operation using thefirst interlace index and an offset which is one of predeterminedintegers.
 14. The terminal of claim 13, wherein information indicatingthat interlace resources are used for uplink transmissions is receivedvia higher layer signaling.
 15. The terminal of claim 11, wherein thefirst interlace resource includes a plurality of equally spaced resourceblocks including a first starting resource block based on the firstinterlace index, and wherein the second interlace resource includes aplurality of equally spaced resource blocks including a second startingresource block based on the second interlace index.
 16. A base stationin a communication system, the base station comprising: a transceiver;and a controller coupled with the transceiver and configured to:transmit, to a terminal, configuration information for a physical uplinkcontrol channel (PUCCH), wherein the configuration information includesinformation on a PUCCH resource including a first interlace index for afirst interlace resource and a second interlace index for a secondinterlace resource, and receive, from the terminal, uplink controlinformation (UCI) on at least one interlace resource of the PUCCH,wherein the at least one interlace resource for receiving the UCI isbased on a UCI payload size and a code rate associated with the firstinterlace resource.
 17. The base station of claim 16, wherein in casethat a quantity of information bits determined based on the code rateassociated with the first interlace resource and the first interlaceresource is equal to or larger than the UCI payload size, the firstinterlace resource is used for receiving the UCI, and wherein in casethat the quantity of the information bits determined based on the coderate associated with the first interlace resource and the firstinterlace resource is smaller than the UCI payload size, the first andsecond interlace resources are used for receiving the UCI.
 18. The basestation of claim 16, wherein the second interlace index is associatedwith a modulo operation using the first interlace index and an offsetwhich is one of predetermined integers.
 19. The base station of claim18, wherein information indicating that interlace resources are used foruplink transmissions is transmitted via higher layer signaling.
 20. Thebase station of claim 16, wherein the first interlace resource includesa plurality of equally spaced resource blocks including a first startingresource block based on the first interlace index, and wherein thesecond interlace resource includes a plurality of equally spacedresource blocks including a second starting resource block based on thesecond interlace index.